https://www.the-fanboy-perspective.com/the-concept-of-a-shared-universe-is-old-news-a.html

Happy Days was actually a spin-off of Love, American Style, but that still makes it a shared universe of its own, the same logic applies to the Superman/Supergirl and Daredevil/Elektra situations. Being a spin-off does not mean it cannot be a part of, or create, its own shared universe.

The Happy Days shared universe was actually a fairly interwoven one, with the Fonz and Richie appearing on Laverne & Shirley and living close-by. Mork first appeared on Happy Days, Out of the Blue was a spin-off of Happy Days and Joanie Loves Chachi was a very direct spin-off of Happy Days. The main character of Blansky's Beauties was Nancy Blansky, who turned out to be a cousin of Howard Cunningham. The animated shows also followed the TV continuity, I believe the Mork & Mindy cartoon was a prequel as well.

Speaking of Out of the Blue (https://web.archive.org/web/20061031153805/http://www.jumptheshark.com/o/out_of_the_blue.htm), here's the retrospective on it from "13 Week Theatre":
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that's a fun family to be a part of

Speaking of Out of the Blue (https://web.archive.org/web/20061031153805/http://www.jumptheshark.com/o/out_of_the_blue.htm), here's the retrospective on it from "13 Week Theatre":
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What's interesting is that due to a scheduling error, the Happy Days episode that debuted Random aired before the Out Of The Blue pilot, so HD was "introducing" a character that had already bowed.

So, does this mean Out Of The Blue is not a spinoff of Happy Days?? (runs and hides)

Blansky's Beauties is interesting in that, while technically a Happy Days spinoff, the show appeared to be taking place in then-present day 1977. So apparently, Nancy Blansky, Pinky, and Arnold were all time travellers.

Then again, by 1977, Happy Days was paying less attention to 50s period detail -- especially in regards to clothing and hairstyles -- so I guess it really didn't matter much.

Blanskies Beauties is awful. Garry Marshall by this time thought his viewers were idiots. And he had Scott Baio on it too. Ugh. He really loved scott.

Blanskies Beauties is awful. Garry Marshall by this time thought his viewers were idiots. And he had Scott Baio on it too. Ugh. He really loved scott.

Somebody had to.

Marshall put him in four series...which is four too many.