The key moments in the episode are well-known enough: Johnny's speech about mobile homes, René Enríquez (whom MTM would use on Hill Street Blues a few years later) looking like he's on the verge of cracking up while playing an interpreter mis-assigned to a group of Japanese executives, and Les's "godless tornadoes" speech. Mr. Carlson's phone call to the little girl is based on one of those radio urban legends that WKRP used from time to time.
Jan Smithers and Tim Reid don't appear in the episode. The original idea was that some of the characters would not appear in every episode, that they'd be recurring semi-regulars like Mr. Carlin on Bob Newhart. Eventually Hugh Wilson decided that everybody should be in every episode, so this is the last episode without Reid, and there was only one more episode ("Bad Risk") without Smithers.
Cold Open and Act 1
Act 2 and Tag