When Hank is showing Bobby how to hold a cigarette, the number of butts in the ashtray continually changes.
There are two scenes in which characters open doors and there is nothing but a black void on the other side.
When the family goes to Motel Arlen and the counselor tells the crowd, "look to the left," Peggy looks to the right. When he says to the crowd, "now look to the right," Peggy looks to the left.