Continuity mistake: Rudy takes the coat from one of the kids and puts it on the back of the chair Cliff is sitting on, at one point it falls off, it then reappears behind him, then moves to the table next to him.
Character mistake: When Dabnis and Vanessa first enter, Vanessa can be heard saying. "Hi, Grandpa. Hi, Rudy," when she is greeting Grandpa and Olivia.
Chosen answer: That is the song "Open the Door Richard."