Lummie

Continuity mistake: Finch runs into the girl's bathroom when the laxatives affect him. He tries to take out a toilet seat cover, but there are none left. The side shot shows a corner of the box hanging down below the dispenser, whereas when the shot changes to the front, there is no visible corner. It then returns to the side and the visible corner, and back to the front with no corner. (00:58:35)

Continuity mistake: When Finch is moping through the house, depressed, he goes through a door marked "keep out". The door handle is on the left side, meaning that from inside the room the handle must be on the right. However, when he plays with the pool balls, we can see that the door he must just have come through (there's no other door visible) has the handle on the left. (01:16:30)

Continuity mistake: When Stifler's mom seduces Finch, you can clearly see Finch playing with the balls on the pool table. The camera cuts to another shot, and when it's back to Finch, the balls are back in the original place. (01:20:13)