Angry Joe constantly screwing up the "Hello. My name is Inigo Montoya." line by forgetting that the line was referring to Montoya's father, and not his brother/mother/lawyer/hamster; only to be corrected by someone else. Taken to the logical extreme in Part 7, when Joe refers to himself as "Amigo Toyota" (but does get the "father" part right), and everyone else just facepalms in the background.
This winds up generating a fan (and cast) favorite line out of The Cinema Snob in episode 6
Spoony losing and promptly running back to retrieve his hat. Seemingly ended as of Part 3, abandoning it after being blasted off during his You Shall Not Pass attempt.
The running gag wasn't even intentional. Spoony genuinely kept losing his hat, realising it was gone and going back to get it. They just decided to keep it in the final product. That doesn't stop it from being hilarious, though.
The Critic stopping Ma-Ti from joining the adventure with increasingly ridiculous Snipe Hunts.