When Jeff plays the computer game in the kitchen and stops to look at Steve and Susan, the screen display changes between shots.
In the flashback of Steve learning Susan has discovered his porn tape, a strand of hair hangs over his forehead. In the next part of the flashback, when he sees Susan vacuuming the living room, his hair is more neatly combed.
When Patrick tells Jill she's the only one who likes his haircut, he closes his mouth with a solemn expression. In the next shot, he is suddenly chewing and his mouth is puckered up.
In the kitchen, after Susan suggest that Steve "Go and hide your videos", there is a boom mic wagging in the top left of the shot, before Steve scurries out the door.
Patrick seems to arrive at the party with Sally, but then flirts with Jill and subsequently sleeps with her. Sally doesn't show any sign of disapproval that Patrick is interested in someone else, which is out of character for her.