Factual error: In the episode, "Professor Blackjack", Manny puts a stack of one hundred dollar bills on the card table for the professor to bet. The bills are the new ones issued a few years ago with the enlarged portrait of Benjamin Franklin. The scene is supposed to take place in 1961.
Continuity mistake: While Mike is cleaning out the armadillo's hay, just before he finishes the second one you can see the amount of hay in the bin is a few inches from the top of the bin. The next shot goes to a close up of him removing more hay but the amount of hay now in the bin is a bit below the top.