Julie trips over a power cord and slides face first across a sopping wet kitchen floor. However, when she stands up she's perfectly dry.
Hal is sat in the kitchen with his box of LAUGHTER THOUGHTS. When talking to Malcolm, Hal first has an index card in his right hand then does not have an index card in his right hand.
After Malcolm reveals Reese's plan for the damaged Mighty Man toy, the way Lois holds the toy changes between shots.
When we first see Reese with a back pack, it is slung over his right shoulder. He walks into the bedroom and it is on his left shoulder.
Lois is in the bath. near her right shoulder there is a bottle of pink (shampoo?) that is near empty when viewed from the front and full when viewed from her left.
When Lois in the bath, she is wearing a bra.
After Reese kicks the trash can over, he and Malcolm are arguing in the kitchen. Right before Reese says the line, "It's anarchy, baby," a large bug can be seen crawling down the wall behind him.