I saw this one twice before I figured out that this slipup was there. It's the episode where Helga is doing standup comedy about her friends and they get upset with her. Stinky was mad at Helga for making fun of his love for Lemon Pudding. Anyways, he was arguing with her in the lunch line. After a while of this he says "oooh...Lemon Pudding!" Helga walks into the dining area of the cafeteria and Stinky is already sitting with a group of friends...Hmmmm...superhuman speed. Cool huh?