Factual error: The show is set in the fifties but Fonzie has a Mustang hubcap on the wall of his garage. The first Mustang came out in 1964.
Factual error: When Arnold's is seen from the inside, metal pinball machines are seen. Since this show is set in the 50's, the pinball machines should be wooden. Metal pinball machines didn't show up until the 70's.
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Suggested correction: Steel pinballs date back to the 1940s.
Factual error: The show takes place in Milwaukee, but several times palm trees are visible in the background. One blatant shot is over the wall at Arnold's.
