When Jerome visits Professor Sandiford, Sandiford is smoking a cigarette that disappears and reappears between shots.
During the 'you haven't been laid' dorm scene, the fabric on Matthew's dressmaking model switches from draped around the model to wrapped around it like a scarf almost instantaneously.
When Jerome is the bartender at the party, he twists the top off of the beer and gives it to Jonah. Hoegaarden does not come in twist off bottles.
At about midpoint, when the front page of the Post is shown onscreen that has a story about the murder of Peggy Clarke, the main headline is about global warming. However, the story underneath is all about absenteeism in schools.
When Jerome's roommate, the fashion designer, is sewing on his machine, it wasn't threaded correctly. The spool was on the bobbin loader, not the spool pin where it should be.