TV Fact: Fred & Wilma Flintstone were the first couple on TV to be shown sleeping in the same bed. It caused quite a stir because prior to this, it was considered too risque for even a married couple to be shown sleeping together on television.
Another TV fact: Babylon 5 was written & mapped out over its 5-season run almost entirely in advance by it's creator & main writer and director, J. Michael Straczynski. It was quite a risk, since most individual episodes on most other TV shows, sci-fi or otherwise with the exception of soap operas, didn't do much to advance a larger overall plot for their show (at least until B5 came out, which popularized the concept for non-soap operas and proved it was viable), not to mention the ever-present risk of cancellation. Because of this, he expressly forbade improvisation on the set, lest an improvisation by one of the actors on-camera necessitate a change in his overall story arc. Despite this, he still was able to implant "trap doors" or plot sequences for every major character to leave the show, should the actor leave for whatever reason, and which was actually used to great effect on several occasions to not only allow the actor to leave (and thus the character to either die or go elsewhere), but to still advance the show's overall story arc. Straczynski was also fond of inserting site gags (that usually had nothing to do with the plot except to break the tension in an episode), such as the "fasten/zip conversation", the Flying Elvis convention, and the captain shoving a stuffed teddy bear out of an airlock...