There were many references to different bars and nightclubs on many episodes of Bewitched. We may think of the 60s era TV shows to be totally wholesome and clean, but the actors definitely had their fun, on set and off. You may not think the scene back then would be a sitcom set, but it sounds like the actors and crew had quite the fun time.
Drinking was commonplace on the set of Bewitched, both for purposes of shooting a scene where the characters were drinking, and even when it had nothing to do with the scene. Apparently the drinking was reigned in when children were on the set. Instead of real booze, ice tea was used as a substitute for those scenes where an actor should have alcohol in their hand.