Carla says that potato skins are free during happy hour. It was established in the sixth season that happy hours were illegal in Massachusetts.
Photographs, sports trophies and other irreplaceable bric-a-brac were destroyed when fire gutted Cheers in the previous episode. All that bric-a-brac is back on the walls now that Cheers has reopened.
In the opening scene when Tim enters Cheers, Sam calls him "Ted".