Revealing mistake: When Arnold's burns down you can see the set walls wobble a lot.

Happy Days (1974)
1 revealing mistake - chronological order
Starring: Ron Howard, Henry Winkler, Marion Ross, Tom Bosley, Erin Moran
The People vs. the Fonz - S11-E11
Factual error: When the Cunninghams are talking about Fonz's trial, Mr. Cunningham can be seen wearing a digital watch. Digital watches didn't exist in the 50's.
Richie Cunningham: A shark? That is the stupidest thing I have ever heard.
Fonzie: Stupid, yes. Also dumb. But it is something I've gotta do.
Richie Cunningham: Fonz, you're not jumping over garbage cans on a bike. You're jumping over a shark. On nothing! On a couple of little skis! One little slip and chomp! Chomp! Chomp.
Fonzie: Thanks a lot for your support. Look, I was challenged. I gotta jump.
Trivia: In many episodes you can see a pennant near the jukebox that reads Stacey vertically. That's in homage to Henry Winkler's wife, Stacey Weitzman.
Question: How could the play "The Rainmaker" still be performed after Fonzie scared off the director?





Answer: If all the actors and hands know their roles well enough they could perform the play reasonably well even without a director.
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