A Connection to the Rocky Franchise

Cousin Eddie, played by Quaid, has a son named Rocky in the film. This is a direct nod to the character Rocky from the boxing films of the same name starring Sylvester Stallone. As it turns out, Sylvester Stallone picked up on this reference who then included footage from Christmas Vacation in his film the next year, Rocky V.

Furthermore, Rocky's Las Vegas shirt in Christmas Vacation hinted at where the next Vacation film would take place, in Las Vegas, Nevada.

The Film Doesn't Have an Official Soundtrack, But Someone Did Release a Fake One

Although the film included many classic holiday tracks such as "Rudolph the Red-Nosed Reindeer" and "Here Comes Santa Clause," no official soundtrack for the film was ever released. In 1999, however, a bootleg version appeared that claimed to be the "10th Anniversary Limited Edition."

These were being sold in online auctions claiming that Warner Bros. had pressed 20,000 of the copies that had supposedly been given out specifically at Six Flags amusement parks. They were deemed as fan-made with the biggest clue being that the soundtrack had the wrong version of the film's title track.