I watched another one of these outakes with Rod,Jane and Freddy years ago on another UK tv programme,cant remmember the name of the show that played it,it was funny as hell!
But,no these were never shown to kids on the original Rainbow.
Guess it was a way for the actors to have a laugh and vent.
At the end of the production year (around Christmas), each of the stations would try and outdo the others with parodies of their shows and other odd creations. This is one such exampleâ€â€it was never aired on television.
Reminds me somehow of one of the Teletubbies "actors" who got fired after he took one of the other Teletubbies from behind... seemed this kind of humour wasn't so funny for the set... Blah! It's a kiddies show! Blah! Blah! Obscene! Blah! (and other mindless ramblings)