Continuity: Prince's motorcycle tire changes from a street tire to an off-road tire when he is near the river.
Boom mic visible: When Apollonia says "I'm thinking about buying a guitar", the boom mic is visible.
Crew or equipment visible: In the Let's Go Crazy sequence, when Morris Day is examining himself in a mirror, he takes a step to the side, revealing a stage hand in a white cap in the mirror. He realises he's in the shot and takes a step to the side.
Continuity: During the "Purple Rain" performance, Prince's shirt starts to unbutton. After he runs to unlock his bike, to make his get away, it's buttoned up.
Audio/visual unsynchronized: When Jerome and Morris are walking around the block, discussing the problems with the girls' group, as Morris says: "That Apollonia babe we saw last night" his lips don't move in sync with the dialogue dub. He's actually mouthing "Vanity" instead of "Apollonia", indicating that this scene was filmed before Vanity backed out of the shoot.
Continuity: The notecard application Apollonia fills out in the first club scene lists her experience as "Singer & Dancer," yet when it is posted on the board in later scenes this section is blank.
Revealing mistakes: While performing Purple Rain towards the end of the movie, The Kid is playing his electric guitar without it being plugged into an amplifier. As he continues singing he is waving his hand, not playing the guitar, but his guitar can still be heard in the song as his other hand is pressing the frets.