Continuity mistake: In Season 2: Episode 15, when Francis and a group of people are volunteering at the Lucky Aid, Craig mentions to them that he might've accidentally mailed the marked inventory numbers to his mother. However, in this episode, Craig has never seen or interacted with his mother because his father told him when he was a child that she passed away.
Continuity mistake: In the side of the story when Lois takes the boys, Malcolm has some kiddy bumpers put in to help him bowl. In the next scene when Reese is about to tell Beth the joke, you can see the lane which Malcolm was just at but there are no bumpers in the gutters. Then later when Malcolm stands up to Lois they are back in the gutters.Professor Lazarus