Continuity mistake: When Gazoo crash-lands his flying saucer, the top portion of his helmet and his antenna are shown to serve as the roof of the spacecraft. This is what Fred grips to try and open the saucer. While attached to the saucer, the top of the helmet is completely smooth except for the antenna sticking up. However, once Fred has loosed Gazoo from the ship, Gazoo's helmet now has a prominent ridge running the entire length of the helmet from front to back. This ridge should have been, but wasn't visible while Gazoo was still in the ship.
Flintstones in Viva Rock Vegas (2000)
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Directed by: Brian Levant
Starring: Stephen Baldwin, Mark Addy, Jane Krakowski, Kristen Johnston
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More mistakes in Flintstones in Viva Rock Vegas
Fred Flintstone: Hey, was that an insult?
Gazoo: Well, if the shoe fits.
Barney Rubble: What's a shoe?
Gazoo: Than I guess it was an insult.
Trivia: William Hanna and Joseph Barbera, creators of the Flintstones cartoon series, can be seen during the wedding of Fred and Wilma towards the end of the movie. There is a brief shot of them together singing along to the Flintstones theme song.