My favorite CHEERS teaser

More of your Friday questions and my attempt at answers.
Phillip B asks:

I noticed that the opening on CHEERS was often entirely unrelated to the rest of the episode. Was it just a chance for a good joke, was it made detachable knowing it was going to get cut in syndication, or was this a chance to give a chance for an actor to more fully develop their role?
Doing a self-contained bit as a

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