Continuity mistake: When Robbie and Julia are making their friend the limo driver run through the obstacle course to prove his driving ability, you can clearly see both right-side hubcaps come off the car. Then, just a few seconds later, the hubcaps are back on the limo.
Continuity mistake: When Otis gets off the tour bus and comes over to kiss Josephine, his hair changes from processed to natural, before he kisses her.
Continuity mistake: When Arthur first goes into his room with the new Brian Slade record, you see him lodge the top of his chair under the knob of his door, but after he starts the music, they show him laying down on the carpet, and you can clearly see the top of the chair facing away from the wall.
Continuity mistake: When they are having the "piano duel", Jellyroll Morton stands up in front of the piano, and his chair slides back about a metre, the scene cuts to the audience, and then when it comes back a second later, the chair is back right behind him again.
Continuity mistake: At the beginning of the song "Old Deuteronomy" watch the positions of Jo Gibb and Drew Varley flip flop in the background between long and close shots. Soon afterward, Cassandra slides down to the stage in a closeup and immediately slides down again in the long shot (while singing different lyrics). Apparently the long and close shots were often filmed in different takes and the choreography and positioning of actors were sometimes not matched very well.
Continuity mistake: As Buddy and the kid pull away in the car for the first time, Buddy is staring out the right side of the car. The shot cuts to a different angle and he's looking more toward the left.
Continuity mistake: The young son of the Chinese owner of the violin is near-sighted and his glasses have concave lenses. When he attends the auction as an adult he is far-sighted with incredibly thick convex lenses.
Continuity mistake: When LV begins her big concert, she carries a microphone on a cord. But after her first song, a stand instantly appears on stage without any stage hand moving from the wings.