Beverly Hills, 90210 (1990)
0 deliberate mistakes in season 1 - chronological order
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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: Was Valerie Malone introduced this season to balance out Brenda's departure?
Chosen answer: Yes, she was.