When Bud is sitting on the couch next to Al his left hand is on his stomach then when they cut to him after Peg comes out of the kitchen it is now his right hand and the right before he goes upstairs after Kelly comes down his left hand is back on his stomach. All this takes place in the span of a couple of seconds so he could not have moved his hands.
When Steve opens up the door to the garage, the background shows that he entered from a narrow hallway with a paneled wall. He should be entering from the living room, with a brick wall and a desk in the background. This reveals that the set used to film garage scenes and the set for the living room scenes are separate.