Trending badgeTrendingPosted 2 hours agoI Genuinely Can't Watch "National Lampoon's Christmas Vacation" The Same Way After Learning These 25 FactsDrumroll, please......drumroll.by Jeremy HayesBuzzFeed ContributorFacebookPinterestLink It wouldn't be the holiday season if we didn't bring up the good old-fashioned Griswold Christmas. The classic holiday comedy National Lampoon's Christmas Vacation (1989) is one of those films I quote year-round, so drumroll, please... Tap to play GIF Tap to play GIF Warner Bros. / giphy.com Here are 25 National Lampoon's Christmas Vacation facts that will make this the hap-hap-happiest Christmas since Bing Crosby tap-danced with Danny F*cking Kaye. Tap to play GIF Tap to play GIF Warner Bros. / giphy.com 1. One of the scene-stealing characters in Christmas Vacation is Aunt Bethany. She indeed left her mark, because this was Mae Questel's (Aunt Bethany) final movie. Her film career began way back in 1930, when she was the voice of none other than Betty Boop! Tap to play GIF Tap to play GIF Warner Bros. / giphy.com 2. Although Jeremiah S. Chechik directed the film, the original director was slated to be Chris Columbus, who you probably know for movies like the first two Harry Potter installments and Mrs. Doubtfire. But he quit the project, since Chevy Chase was been reportedly known for being challenging to work with. Chris Columbus went on to direct an equally classic holiday film: Home Alone (1990). Tap to play GIF Tap to play GIF 20th Century Fox / giphy.com 3. Snots, Eddie's dog, wasn't just some random dog hire. This good boy was said to be Beverly D'Angelo's (Ellen) real-life dog. Now, roll over and let Uncle Clark scratch your belly! Warner Bros. 4. Aunt Bethany's cat was ALSO believed to be Beverly D'Angelo's real-life cat. You read that right. Both the cat and the dog in this film belong to Beverly. It must be nice to have your pets on set with you...just don't wrap them up for Christmas. Tap to play GIF Tap to play GIF Warner Bros. / giphy.com The squirrel used on set belonged to, you guessed it, Bev...no, I just wanted to make sure you were still paying attention. SQUIRRELLLLLLLL!!!!! Warner Bros. 5. The bulk of the movie was filmed in Burbank, California, and a minor earthquake occurred while filming. It happened during Aunt Bethany's arrival. Tap to play GIF Tap to play GIF Warner Bros. / giphy.com 6. Bill Murray's brother, Brian Doyle-Murray, appears as two different characters in the franchise. Brian plays Clark's boss, Frank Shirley, in Christmas Vacation and then a desk clerk in National Lampoon's Vacation (1983). Warner Bros. 7. This was Randy Quaid's first appearance in the Vacation series as Cousin Eddie since the original National Lampoon's Vacation. He was absent in European Vacation (1985), but since they were stateside, it only made sense to bring him back into the fold. Tap to play GIF Tap to play GIF Warner Bros. / giphy.com 8. Aunt Bethany and Uncle Lewis were married in the movie, but William Hickey (62), who played Lewis, was actually 19 years younger than Questel (81). Warner Bros. 9. Diane Ladd (born 1935), who plays Clark's mom, Nora, is only eight years older than Chevy Chase (born 1943)-a strange fun fact, but still a fun fact. Warner Bros. 10. Christmas Vacation is the only Vacation movie not to feature Lindsey Buckingham's "Holiday Road," which makes sense since it is not a road trip. Stephen J. Cohen / Getty Images 11. Filmmakers actually offered Lindsey Buckingham the opportunity to write the movie's theme, but he declined. Mavis Staples went on to perform the opening song, "Christmas Vacation." Warner Bros., Per Ole Hagen / Getty Images 12. The home movie that Clark watches in the attic is labeled "XMAS '59," which is also the name of John Hughes' short story that inspired this film ("Christmas '59"). Warner Bros. 13. Rocky, Eddie's son, is first seen wearing a Vegas shirt, foreshadowing the next Vacation film, Vegas Vacation (1997). Warner Bros. 14. This movie features four Oscar nominees: Juliette Lewis, Diane Ladd, Randy Quaid, and William Hickey. That's a lot of acting firepower for something meant to be a slapstick comedy. Tap to play GIF Tap to play GIF Warner Bros. / giphy.com 15. Chevy Chase was forced to turn down Honey, I Shrunk The Kids (1989) due to commitments with this film. The role of Dr. Wayne Szalinski ultimately went to Rick Moranis. Everyone wins in the end. Warner Bros. / giphy.com 16. Chevy Chase broke his pinky finger while punching Santa Claus. He resorts to kicking and clubbing the decorations after that. The film kept rolling, and the take was used. Tap to play GIF Tap to play GIF Warner Bros. / giphy.com 17. Beverly D'Angelo improvised the visual gag of Ellen grabbing Clark's crotch when the SWAT team holds up the house and tells everyone to freeze. It's the handshake that kills me. Warner Bros. 18. Cast members not on-screen for Clark's rant, who were facing Chevy Chase, each had a sign hanging around their necks