Question: In all the Vacation movies, the children are played by different actors. What is the reason behind this? Is it simply a joke?
Answer: Ironically in 2003, Dana Barron (the original Audrey in the first film) returned as Audrey Griswald in "Christmas Vacation 2: Eddie's Island Adventure" although this film did not contain Chevy Chase, Beverly D' Angelo or a Rusty actor (Rusty not in this film).
Question: I've always found it odd that although Wallyworld is closed, the car park is still open and accessible. Is this normal for closed US parks, or could it be considered a goof?
Chosen answer: The parking lot is huge. There's really not any way to close the lot itself, but even if there were gates, Clark would probably have been oblivious to them by then.
Question: Where were the Wally World scenes shot?
Answer: The Wally World scenes were shot in two locations. At Santa Anita Park in Arcadia, California and Six Flags Magic Mountain in Valencia, California. The parking lot scene was filmed in Santa Anita Park's large parking lot, whilst the scenes taking place inside Wally World were shot at Six Flags Magic Mountain.
Question: Who voices Marty Moose?
Answer: Harold Ramis voiced Marty Moose.
Question: How many times does the luggage fall off the station wagon throughout this trip?
Chosen answer: Five times. The first time is when the Griswald's leave the house because the luggage hit the garage roof (00:09:05). The second time is going into the motel. The third time is about half way through the movie where two bags fall off the station wagon (00:49:00). The fourth time is when the station wagon flies off the closed road where every single bag falls off due to the crash (00:50:35). The fifth time is in the scene where Aunt Edna dies and Clark stops the car immediately where all but one bag falls off (01:02:30).
Question: On the rollercoaster, why did Rusty say to the guard that Clark killed Aunt Edna? He had nothing to do with her death.
Chosen answer: Rusty was just being an ass. That's his character, him and his dad are usually going at one another. They really play up this relationship in European vacation.
Answer: Maybe, too, because he inadvertently killed her dog so maybe that killed her, too.
Answer: According to the commentary from "Christmas Vacation" this is an inside joke referencing the fact that Clark is away from home so much with work, he hardly even recognizes them anymore. "European Vacation" could not obtain the same kids who played in the original Vacation, namely Anthony Michael Hall, and tried to cast kids whom looked close. Thus the joke began. No doubt the actors' aging between movies also plays a part.
Jazetopher