- Paul Brickhill, who wrote the book from which the film is based, was piloting a Spitfire aircraft that was shot down over Tunisia in March 1943. He was taken to Stalag Luft III in Germany, where he assisted in the escape preparations.
- The film was shot entirely on location in Europe, with a complete camp resembling Stalag Luft III built near Munich, Germany. Exteriors for the escape sequences were shot in the Rhine Country and areas near the North Sea, and Steve McQueen's motorcycle scenes were filmed in Fussen (on the Austrian border) and the Alps. All interiors were filmed at the Bavaria Studio in Munich.
- When the Bavaria Studio's backlot proved to be too small, the production team obtained permission from the German government to shoot in a national forest adjoining the studio. After the end of principal photography, the company restored (by reseeding) some 2,000 small pine trees that had been damaged in the course of shooting.
- For the train sequences, a railroad engine was rented and two condemned cars were purchased and modified to house the camera equipment. Scenes were shot on the single rail line between Munich and Hamburg, and a railroad representative was on hand to advise the filmmakers when to pull aside to avoid hitting scheduled oncoming trains.
- During the climatic motorcycle chase, John Sturges allowed Steve McQueen to ride (in disguise) as one of the pursuing German soldiers, so that in the final sequence, through the magic of editing, he's actually chasing himself.
- Several cast members were actual P.O.W.s during World War II. Donald Pleasence was held in a German camp, Hannes Messemer in a Russian camp and Til Kiwe and Hans Reiser were prisoners of the Americans.
- Charles Bronson, who portrays the chief tunneler, brought his own expertise and experiences to the set: he had been a coal miner before turning to acting and gave director John Sturges advice on how to move the earth. As a result of his work in the coal mines, Bronson suffered from claustrophobia just as his character had.
- Although Steve McQueen did his own motorcycle riding, there was one stunt he did not perform: the hair-raising 60-foot jump over a fence. This was done by McQueen's friend Bud Ekins, who was managing a Los Angeles-area motorcycle shop when recruited for the stunt. It was the beginning of a new career for Ekins, as he later doubled for McQueen in Bullitt (1968) and did much of the motorcycle riding on the television series "CHiPs" (1977).
- Hilts (Steve McQueen) strings a wire across the road to obtain a motorcycle. McQueen himself played the German motorcyclist who hits the wire.
- The motorcycle scenes were not based on real life but were added at Steve McQueen's suggestion.
- Steve McQueen also personally attempted the jump across the border fence, but crashed. The jump was successfully performed by Bud Ekins.
- Wally Floody, the real-life "Tunnel King" (he was transferred to another camp just before the escape), served as a consultant to the filmmakers, almost full-time, for more than a year.
- The real-life escape preparations involved 600 men working for well over a year. The escape did have the desired effect of diverting German resources, including a doubling of the number of guards after the Gestapo took over the camp from the Luftwaffe.
- The real-life escape was on the night of 24 March 1944, and the ground was snow-covered. The German town near the prison camp, called Neustadt in the film, was really Sagan (now Zagan, Poland). Steve McQueen was born on March 24th.
- The nationality of a few of the prisoners in the story was changed, emphasizing American, and de-emphasizing Commonwealth and other Allied.
- The gold medallion Steve McQueen wears throughout the film was a present from his wife.
- Steve McQueen accepted the role of Hilts on the condition that he got to show off his motorcycle skills.
- In the scene following Hilts' theft of a German motorcycle, he rolls into a nearby town, and stopped by a police officer. He tells Hilts something in German, to which Hilts kicks him away and rides off. The officer asked Hilts for identification papers Hilts doesn't have.
- Steve McQueen held up production because he demanded that the script be rewritten to give his character more to do.
- Though seemingly hauled away for allowing the escape to take place, the Commandant was actually arrested for being involved in a brisk black-market operation, a fact unearthed during the Gestapo investigation of the escape.
- Ramsey's title, 'S.B.O' stands for Senior British Officer.
- Roger Bartlett is modeled after Roger Bushell, a British officer who was involved in the real escape and, like Bartlett, was executed for his role therein. The scarring around Richard Attenborough's eyes is a tribute to Bushell, who received such scarring from a competitive skiing accident.
- One day, the police in the German town where the film was shot set up a speed trap near the set. Several members of the cast and crew were caught, including Steve McQueen. The Chief of Police told McQueen "Herr McQueen, we have caught several of your comrades today, but you have won the prize [for the highest speeding]." McQueen was arrested and briefly jailed.
- McQueen's character Hilts was based on amalgamation of several characters, including Major Dave Jones, a flight commander during Doolittle's Raid who made it to Europe and was shot down and captured and Colonel Jerry Sage, who was an OSS agent in the North African desert when he was captured. Col. Sage was able to don a flight jacket and pass as a flier otherwise he would have been executed as a spy. Another inspiration was probably Sqn Ldr Eric Foster who escaped no less than seven times from German prisoner-of-war camps.
- MacDonald (Intelligence) is based on George Harsh, a very good friend of Wally Floody (the real Tunnel King). They were both transferred to Belaria before the escape. Harsh was a very interesting character who was from the American south and had joined the RCAF as a tail-gunner. In the 1920s Harsh had committed murder and was sent to jail for life. A medical student, Harsh performed an appendectomy on a dying prisoner and saved his life. The governor of Georgia granted him a pardon and he was set free. After the war, he had personal problems as he was plagued by guilt over the crime he committed as a youth; on top of adjusting to life after fifteen years in captivity (12 years on the Georgia chain gang, followed by three years as POW). On Christmas Eve 1974, he did shoot himself but survived. A stroke soon after left him partially paralyzed. When that happened, Wally Floody and his wife brought him up to their Toronto home and looked after him. He eventually went to live -at his own urging- at the Veteran's Wing at the Sunnybrook Medical Centre. He died in January of 1980.
- James Garner developed his "Scrounger" character from his own personal experiences in the military during the Korean War.
- In issue 73 of Your Sinclair magazine in January 1992, the Spectrum stealth game adaptation of this movie was voted the 23rd best game of all time.
- When celebrating the Fourth of July and pouring alcohol, Hilts (Steve McQueen) is thrown off by an ad-lib by Goff (Jud Taylor). While Hilts is drinking, Goff says, "No taxation without representation." McQueen jumps out of character and gives him a look (and mouths, "What?") The director must have signaled to "just go with it" and the scene continues. But it is an obvious ad-lib.
- The medal that Colonel von Luger wears around his neck is the Pour le Merite, also known as the Blue Max. Originally a Prussian military honor, in the First World War it was automatically given to fighter pilots who shot down eight planes (later raised to sixteen). The Nazis replaced it with the Knight's Cross but it could still be worn by officers who'd won it before the Third Reich.
- Most of the planes in the airfield are actually American AT-6 Texan trainers painted with a German paint scheme, but the one actually flown is an authentic German plane, a Bucker Bu 181 'Bestmann.'
- Donald Pleasence had actually been a World War II prisoner of war. When he kindly offered advice to the film's director John Sturges, he was politely asked to keep his "opinions" to himself. Later, when another star from the film informed John Sturges that Pleasence had actually been a RAF Officer in a World War II German POW Stalag camp, Sturges requested his technical advice and input on historical accuracy from that point forward.
- During production, Charles Bronson met and fell in love with David McCallum's wife, Jill Ireland, and he jokingly told McCallum he was going to steal her away from him. In 1967, Ireland and McCallum divorced, and she married Bronson.
- Donald Pleasence really was an RAF pilot who was shot down, held prisoner and tortured by the Germans.
- Donald Pleasence's character was based partly on London-born John Cordwell, later a Chicago architect and then proprietor of the Red Lion Pub on the city's N. Lincoln Avenue. Cordwell died in 1999. Stories about him and the Red Lion are told from various points of view in the collection "Tales from the Red Lion" (Chicago: Twilight Tales, 2007, ISBN 0977985623).
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: The individual incidents in the film are mostly true, but were rearranged as to both the timing and the people involved. (A note at the start of the film acknowledges this.) For instance, of the 76 who escaped, there were indeed 3 who got away and 50 who were murdered in reprisal, but the murders occurred in small groups, not all at once. (14 Germans were executed after the war for their parts in them.)
- SPOILER: The shooting of the recaptured escapees was one of the charges at the Nuremberg War Crimes Trial of Hermann Göring and other Nazi leaders.
- SPOILER: According to David McCallum, the barbed wire that Hilts (Steve McQueen) crashes into near the end of the film, which was actually made of rubber, was made by the cast and crew during their free time by tying small pieces of rubber around larger ones.
- SPOILER: In real life, the forger was James Hill, so obviously the stuff about him going blind and being shot dead is fiction.
- SPOILER: Whenever a prisoner attempting escape is told "good luck" by a fellow prisoner, the escape fails. Ironically, these are the same words that the German officer uses to capture Bartlett and MacDonald near the end of the film.
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