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

Continuity mistake: When Richie gets up from a table at Arnold's to meet with the Fonz in the men's room he's wearing jeans. When he enters the men's room he's wearing grey slacks. (00:07:50)
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: When this episode first came out, I vaguely remember a scene in the beginning where Ralph runs into Arnold's and yells to the people inside something like, "There's a flying saucer outside!" and no one believes the normal-joking Ralph. Then Richie comes in behind him and yells the same thing, and then the people all scream and flee in a panic, believing Richie. In all years of syndication/reruns, I have not seen this part at all, but remember this part as a kid when this episode was brand new. Did such a part ever exist? (Near the end of the episode, Howard mentions the flying saucer people thought they saw was a weather balloon so I'm figuring so).
Answer: Yes, the ending changed but this was in the beginning of the episode where the question lies.





Answer: When it was originally broadcast there was a different ending. A new ending was added when the show was rerun to set up the Mork and Mindy series.