Continuity mistake: In this episode, Al has taken on the persona of Axel Bundy, a rock star, so he can fly first class with older rock stars. But before they start a jam in the first class lounge pre-flight, one of them calls him AL when he's prodding Al to join the group when all they knew him by was the name Axel.
Deliberate mistake: When the family is trying to get money from Al at the start of the episode, he throws it on the ground making the rest of the family to dive on it and you can see Bud get it, then throw the bunch of money in the middle of Kelly, Peg and Bud so they can all get to it instead of taking it all.
Continuity mistake: When Marcy loses her contact lenses she is run over twice by shopping carts, leaving tire marks on both sides of her clothes. In the overhead showing shot showing all the characters, she is clean. Cut to a closeup, she has the tire marks again.