Plot hole: I don't think the police would throw the wife and children in the same jail cell as Harold.Piemanmoo
Continuity mistake: When Marrianne calls Harold to the table, the plant in the middle disappears as they climb on top of it.Piemanmoo
Revealing mistake: When the van drives upstairs, you can see that it wasn't destroyed.Piemanmoo
Plot hole: Buttercup knocks out villains' teeth so she can get money from the tooth fairy. This makes no sense whether you believe in the tooth fairy, or not. If you do believe, the tooth fairy only gives you money for your own teeth, and I'm sure would be able to tell whether they're your own teeth or not. If you don't believe, and think it's the parents giving the kids money, then it's the professor who's giving Buttercup the money. You'd think he'd be suspicious about where Buttercup is getting all those teeth, and would question her accordingly.