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)