Continuity mistake: In the final dance Julien is wearing the samurai jacket, but when the camera changes angles and then focuses back he isn't wearing the jacket. This happens at least three times.
Revealing mistake: When the sniper is shooting the cans, the close-up of the first can shows the metal peeling out as though the bullet had come from inside instead of outside.
Other mistake: When Kevin and Perry go home to find the postman at the front door, the postman asks Kevin to sign for a letter (his father's). If you look closely at the address on the postman's sheet it does not match the address on the letter. You need to be quick and look closely.
Continuity mistake: When Dr. Coleman wakes up in Anna's body, as Lindsey Lohan exits her room her bedroom door is still removed, but a few seconds after she runs out of the room after Harry the door has been re-attached.
Visible crew/equipment: In the end scene when Tony comes to Stephanie's house to apologise, you can see the microphone coming down from the ceiling. (01:52:20)
Audio problem: When Corny introduces himself at the auto show, the audio is not in sync with his lips.
Continuity mistake: When Wayne and Garth are on their way to the Alice Cooper concert they show the car from behind you can clearly see that Garth is driving and Wayne is in the passenger seat but when they cut back to the car from inside Wayne is driving and Garth is in the passenger seat. (00:56:50)
Other mistake: In the 'Macavity' dance, Demeter makes a mistake with one of her moves and makes an "Oops." face.
Continuity mistake: As Honey Daniels is introducing the dance benefit in the very last scene, the chain she's wearing jumps from outside her shirt/top to the inside and back a number of times between shots.
Visible crew/equipment: Towards the end of the film, Beau and Jeff Bridges are getting into a fighting match in an alley. As Jeff shoves Beau into a chain-link fence, you get a full and un-obstructed view of the boom holder and his microphone on the other side of the fence; just inches from Beau.
Factual error: Buddy Holly is seen singing 'Cryin', Waitin' Hoping' at the Winter Dance Party. He hadn't actually finished composing this song, never mind recording it as a finished piece of work when he went on his final tour. This song comes from his final recordings 'The Apartment Sessions' which he recorded in New York and was finally released after his death, complete with added backing music and vocals.
Continuity mistake: In the first scene where we see David Helfgott, there's a mark on his ring finger, probably made by a wedding ring. In that scene David isn't married.
Continuity mistake: At the beginning of the movie when Flash and the Ebony Sparks are performing, you can see behind Flash, the back-up singer on his right (our left) throw his red sports coat and bow tie on the ground and rips open his shirt. Then when they show a close up of the back-up singers he has it buttoned but is in the process of taking it off. Then when they focus back on Flash, the man's shirt is clearly open, then they go back and he's still trying to open it up and he finally rips it off and goes in the motion of throwing it, but then (less than second) it pans out to show the whole group jump up and do the splits at the end of the song and the man has the shirt on again.
Continuity mistake: Early on Nancy is in a limo and a man with long hair tells her to get drugs. While he's talking his hand goes from resting on his chin to resting on the armrest instantly.
Continuity mistake: When Shawn is teaching the new drummers not to look at their drums while they play, he and Devon play together until Shawn drops a stick. At this point, Dr. Lee comes over and starts playing with Devon, until Devon drops a stick. The drum stick falls from Devon's hand and bounces around on the field. In the next shot, Dr. Lee is talking to Devon, neither has moved, but now Devon has both sticks in his hand.
Continuity mistake: When the reporter is interviewing Bad Blake in his hotel room he is using his pocketknife to cut the meat in his meal. When the shot returns to him, he is using a plastic knife.
Factual error: Morrison did finish film school in real life. He did not drop out as depicted in the film.
Factual error: The film is set in 1987 but most of the street lights seen throughout the movie are LED street lights and some high pressure sodium Philips lanterns (produced from the early 1990s to early 2000s), neither of which were around back then. Similarly many of the shots of the M1 motorway show modern cars and smart motorway/variable speed limits, which never existed at the time.
Factual error: When The Oneders are recording their song with Uncle Bob, there is an In-N-Out cup sitting by the recording equipment. There are no In-N-Out restaurants in PA.
Visible crew/equipment: After Rick is introduced to Lew Eisen, when Eddie/Joe sees Lew he tries to evade him. When Rick catches up with Eddie, there are at least five actors' T-marks visible on the ground. (01:29:20)