The heroes start a fire in the trash can on Klink's office porch. Hogan lights a match and tosses it in on top of the trash but, when the fire starts, it is at the bottom of the can and is obviously a large burner.
When Hogan first sets the jack down, the cross beam on the guard tower is four to five inches above the top of the jack, but in the subsequent close-up it is practically touching the top of the jack.
The "German" truck in which new prisoner Corporal Tillman arrives is a right-hand drive vehicle. Right-hand drive vehicles also appear in several other episodes. They are obviously British-built and painted to appear German.
Tillman claims a six-inch error in placement of the Stalag 13 RADAR station will cause a targeting error of 2000 yards. Since the target is 30 miles due east of Stalag 13, a six-inch error would mean that the last station prior to Stalag 13 is only 13.2 FEET from the Stalag 13 station. Another way to think about it: The target is 30 miles due east of Stalag 13. If the last station before Stalag 13 is 30 miles due west of Stalag 13 (it has to be to the west in order for the bombers to be able to line up on the target - since two points define a straight line), and the Stalag 13 station is off by six inches, the error factor at the target would be only ONE FOOT - essentially irrelevant. And, the further away the last station before Stalag 13 is, the smaller the error.
There was no technology during World War Two, or even today that could make a radar transmitter as small as the one General Tillman had.
When Hogan throws the match into the trashcan in front of Klink's office there is obviously a pyrotechnic device being used since the fire starts at the bottom left of the can not the top right where Hogan throws the match.
When Newkirk throws the knife at the tire he misses to the left of the tire yet it still goes flat. And just to the left of the bumper the wire is visible that the knife traveled upon to reach the tire.
When Hogan is pretending to yell at Newkirk for his "horseplay with the knife" the famous Desilu water tower is visible in the background over the barracks. Hogans Heroes was filmed at Desilu Studios in Culver City California.
When Corporal Walter Tillman finds that one of the wires used to set up the radar unit in the camp was retied after it was broken, he said that the shortened wire would make 2,000 yards difference to the target rocket plant. Taking into account the high altitude the bombers would drop their bombs from, the bombs could not be dropped in a small, specific area. A British report, known as the Butt report, found that only 1 in 10 Allied bombs fell anywhere near a target. Since the rocket plant would be a large instillation, the pinpoint accuracy needed to bomb specific areas in the rocket plant would not be possible. As with all targets bombed by high level bombers, large numbers of bombers dropping large number of bombs (called carpet bombing) would be the only way to cause sufficient damage of the plant to put it out of commission.
Klink asks Hogan "Is it one of the prisoners on this side of the camp?" and Hogan replies "Yes-and he's bigger than a breadbox!".
This phrase was unknown in the 1940s, as it originated as one of Steve Allen's standard humorous questions asked of contestants on the game show "What's My Line?" in 1953.
The phrase "...bigger than a breadbox" was popularized, but not invented by Steve Allen. Various phrases on the theme, such as " It's about as big as a breadbox" and others, were widely used in the 1940's and possibly earlier.
In the beginning, when the new prisoner is brought into the camp by truck, the German guard is armed with an American Thompson submachine gun.