Other mistake: The background action in the opening credits is slightly unsynchronized. This is most obvious at the "Goodbye gray sky, hello blue" line in the theme song, as Potsie mouths the lyrics. It's also obvious at the "My cycle hums" line, as the girl in the blue plaid skirt shows up at "cycle", rather than "my." (01:13:10)
Happy Days (1974)
1 other mistake in season 4
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.
The Fonz: Heyyy.
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.
BaconIsMyBFF