Before Jim Morrison takes his shirt off when he is being photographed, he is wearing a metal flower-like necklace. Once the shirt is removed, he is wearing a white and red beaded necklace.
When Jim Morrison chases Patricia Kennealy in her apartment, he wears a covering from the waist down. When they both fall on the bed and make love, the covering is gone.
When Jim Morrison is chasing Pam around the room, he throws a lamp and knocks a picture partially off. It swings back and forth. A few seconds later, when Pam throws a glass at him from behind a chair, the picture is back up, and only slightly tilted.
After Jim Morrison has chased Pam around the room, he grabs her and asks if she will die for him. A curtain is blowing behind him. A few seconds later, the curtain is no longer blowing. When Jim opens a window, there is no wind.
In the film, a female photographer sexily encourages Jim Morrison to take his shirt off, resulting in the iconic "Young Lion" photo first seen in the Village Voice, and later used as the cover photo for the Doors 1985 "Best Of" album. The photographer was actually a man, Joel Brodsky.
In the film, the New Haven concert is a sold-out show, in a beautiful theater with a balcony. In real life, the show was at the New Haven Arena, a broken-down hockey rink with no balcony. It was also half-empty.
While it's true that the rest of the band decided in Morrison's absence to license "Light My Fire" to Buick for a TV spot, Morrison found out before it aired and veto the deal. Morrison finding out by seeing it on TV is pure fiction.
In the shower stall scene backstage at the New Haven concert reporter Patricia Kennealy reveals to Jim Morrison she investigated his background and states he attended University of Florida. Jim Morrison attended Florida State University.
As with most biopics, some of the events did not occur exactly as they are portrayed in the film, or may have happened at a different time. Some did not take place at all and are included purely for dramatic purposes.
Jim Morrison says "Well we're a sullen group, Ed" without moving his lips. It was done deliberately, to allow the audience into Morrison's thoughts for a moment. If he'd said it directly to Ed Sullivan, he would have been thrown out immediately. Instead, the audience is allowed to hear him think it, which lead to the mischief Morrison got up to on live TV.
Val Kilmer's beard begins peeling off the right side of his face while singing Five to One. It's clearly visible on the closeup shot.
During the magazine photo shoot, Jim Morrison begins to wander around the studio with the photographer following him, still taking pictures. A flash continues to go off, yet there is no flash on the camera, they are still on the stands on the set.
At the UCLA film school, one student stands up to leave. The film shines on his back, but the film shown on the screen is unchanged.
When Jim Morrison is on a window ledge in 1971, a billboard advertising Und wieder 48 Stunden (1990) is visible.
Shortly after the band rehearses "Break On Through", the guitarist starts to play the beginning of "Wish You Were Here" by Pink Floyd. The song was released in 1975.
During the film school project scene, Jim Morrison reads the 1982 Viking/Penguin edition of "The Portable Nietzsche".
Jim Morrison and Tom Baker speak about the two bikers movie directed by Dennis Hopper, in an allusion to Easy Rider (1969). That scene happens during November 1967. Easy Rider wasn't released until July 1969.
In the studio, right before a 1969 concert, the Doors' manager tells Jim Morrison "I am not going to go through this again with you, and lose you at the bottom of a bottle of Southern Comfort like Janis Joplin." The next scene takes place in spring 1970. Janis Joplin died October 4th, 1970.
At the Miami concert, Jim Morrison has a boom stand for his microphone. After a cut to an audience shot, the camera goes back to Morrison, with no microphone stand. After another audience shot, the camera returns to Morisson, and the microphone stand is back.
When the band plays "The End" at Whiskey-A-Go-Go, the drums are not in time.
"The End" is performed using two small organs. The recording in the film uses a Hammond B-3 organ.
As Jim Morrison follows Pam along the boardwalk, a large group of crew members and a boom mic pole are reflected in a shop window.
During the San Francisco concert sequence, the shadow of the cameraman is clearly visible on Jim's shirt.
During the cemetery sequence in Paris, the Steadicam operator's feet are reflected in the grave of Marcel Proust.
Before Jim Morrison is arrested on stage, the woman he is with says he attended the University of Florida. Morrison attended Florida State University.
The London Fog scene takes place in 1966. When the manager asks Jim Morrison's age, he claims to be 21. If the scene took place in 1966, he would be 22 (before December 8) or 23.