Continuity mistake: Leah asks Moose if he brought the cutters, so he looks in his bag then hands Leah scissors. In the shots facing Leah she holds up the scissors by its handles, but in the shots facing Moose she holds up the scissors by its pointy end. (00:10:20)
Continuity mistake: Moose is sitting at a desk writing a letter to Mr. Dunbar in a spiral bound notebook. There is a magazine to the right of the notebook with about the same width. After a couple quick camera shifts, the notebook is suddenly stacked on top of a few magazines and whatever Moose is writing on is obstructed by the stack. After a couple more quick camera shifts, the notebook is back in front of Moose, and he tears out the page he was writing on. (00:25:55)
Revealing mistake: The five dollar bill that was tossed toward Todd's bucket but landed on the rim and hung over the side was obviously fake (not legal tender). (00:18:20)
Other mistake: Moose was narrating what he was writing in his second letter to Mr. Dunbar. There were 64 words, 12 more words after "P.S.", then "Love, Moose." A view of his finished letter showed it was way too short to have included everything he supposedly wrote, and the expected format did not match. (00:26:20 - 00:27:10)