Michael's comic book disappears from Justin's hand between shots.
When Tracy gets to the party, Vic answers the door speaker and tells her to come up but never doesn't press the button for the door. In the next shot, the door is buzzing and she opens the door, but in the next shot of Vic, he's still in the same position as when he initially answered the speaker.
When Michael and Brian are in the sauna, one guy sits to the left of Brian followed by another guy. When the camera angle changes, the 2nd guy isn't there. When the angle changes again, the 2nd guy is back.
At 22:22, Michael thanks Emmett for his gift of the 'Easy-Cake Oven'; but actually calls him Ted.