Question about first episode after Diane leaves

Probably been asked before, if so, apologies. I'm just really curious.

I've been rewatching Cheers on Pluto and just happened to watch the Sam/Diane wedding episode where she goes off to write her book. That episode was followed by the introduction of Rebecca Howe and Sam coming back from his failed trip around the world. Anyway, they mention that Diane did not finish her book but went to Hollywood to write and all kind of laugh about it. Does anyone know if this is a dig at Shelly Long for wanting a movie career or what?