Continuity: Jeffrey's cheek wound disappears in some scenes.
Continuity: Coke glasses appear out of nowhere when Jeffrey and Sandy are in the diner.
Continuity: Jeffrey's earring seems to disappear and reappear.
Audio/visual unsynchronized: In the club, a guitar solo is heard, while no guitarist is present.
Continuity: Frank's beer appears to change in color and level during the scenes at Ben's house.
Continuity: During Ben's lip-syncing performance of Roy Orbison's "In Dreams", Frank abruptly ejects the cassette tape midway through the song. A short while later, he has Paul insert the tape in his car tape player. It immediately starts playing at the beginning of the same song without being rewound.
Continuity: Jeffrey's hands jump between the top of his head and his ear between shots when he is kneeling before Dorothy when she first discovers him in the closet.
Continuity: After Frank and Ben received their glasses there's some froth topping Frank's beer, but not Ben's. However, in the close-up of Ben there's clearly a thin layer of froth. Back to both in frame, and again Ben's beer has no froth.
Continuity: Ben receives his beer from Frank - in the next two shots Ben holds the beer in different places e.g. round the glass, then the handle and back to around the glass.