Other mistake: Throughout the entire 4th series and even various times into the 5th series, pay attention to the shots that show the outside of Steve's Kappa Epsilon Gamma frat house. Every single time, you will notice the same exact two people outside of the frat house - one is a guy wearing a green and white striped shirt sitting in the lawn reading a book, and the other guy is wearing a brown or orange shirt lying on the couch outside. While not impossible, these same exact two characters wearing the same exact clothes doing the same exact things outside of the frat house every single time for upwards of a year or more in 'show time' is unlikely.
Beverly Hills, 90210 (1990)
1 other mistake in Season 4 generally
Continuity mistake: When Dylan pulls up to the After Dark, a group of guys come over and ogle his car, but when Dylan enters the club, one of the guys outside is already at the bar. (00:11:15 - 00:11:50)
Brandon Walsh: It was good to see you back at the Peach Pit tonight. I know it took a lot of courage.
Brenda Walsh: Brandon, please, I've had quite enough praise for a while.
Brandon Walsh: All right, you're a huge loser. How's that?
Brenda Walsh: Oh, much better.
Trivia: When Brandon and Kelly leave the movie theater, they pass a billboard for The House of Yes, which co-starred Tori Spelling.
Question: In the first few episodes, the Walshes live in a different house than the one they live in throughout the series. Nothing was ever even mentioned, I don't think. Was it a mistake, or did I miss the explanation?
Answer: There was no explanation. Usually, when a show doesn't know if it's going to be picked up or not, they will use stock footage until they can spend the money on a real location.
bucade