Character mistake: When he arrives at his hotel room in Vegas, David is surprised that Ray is performing at one of the casinos. But at the beginning of the episode, Steve told Brandon that Ray was performing, which suggests going to see him was part of their plans. So either (1) Steve shouldn't have known Ray was performing there, or (2) David shouldn't have been so surprised.

Beverly Hills, 90210 (1990)
1 mistake in Lost in Las Vegas
Emily Valentine: This isn't Beverly Hills! It's Knot's Landing.
More trivia for Beverly Hills, 90210
Question: Was Valerie Malone introduced this season to balance out Brenda's departure?
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Chosen answer: Yes, she was.