Continuity mistake: During the interview, while sitting, his striped pants are unzipped for a few cuts, then they are zipped in later shots.
Continuity mistake: When Jack is at Deborah's California place talking to her on the couch her arm swaps from raised to lowered between shots.
Continuity mistake: When Deborah tells Jack he must go to LA to make a ton of money his right arm is extended or not depending on the shot.
Revealing mistake: During the interview, you can see a monitor with the lyrics of "Something", even though he is supposedly improvising.
Suggested correction: This is a deleted scene. It is in the extras on the DVD but it is not part of the movie.
Continuity mistake: Before Jack plays "Let It Be" for his parents, he talks to his dad who is holding a coffee mug. His left hand goes from holding the mug to down at his side in the next shot.
Continuity mistake: During the performance of "Help!" on the rooftop at the beach, the weather changes from cloudy to sunny (and vice versa) instantly in different shots.