Corrected entry: In the scene where Steve is talking to his mother via speaker about having dinner together, she tells him to be nice to David Silver, as his father Mel is a "producer casting a part I'd be perfect for. However, in all other episodes, David's father Mel is known to be a dentist in Beverly Hills.
Beverly Hills, 90210 (1990)
1 corrected entry in season 1
Other mistake: When the show aired in 1990, in the pilot episode Brenda falls for Jason. She later on reveals herself to be a "16 year old junior" in high school. Season 2 opens up with the gang on summer break which technically would make them going into their senior year. It wasn't until Season 3 that they were going into their senior year. They graduated in 1993 from West Beverly but the show debuted in 1990 so technically they should have been sophomores.
Steve Sanders: Girls mature faster than guys.
Brandon Walsh: Not in my house they don't.
More trivia for Beverly Hills, 90210
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.
Correction: That is the episode where Steves mom has Mel Silver the producer and Mel Silver David's dad mistaken for one another. Steve was nice to David in this episode until he found out from David that his dad is a dentist, not a producer.