Let me grab two of them. One is "Caution: Murder Can Be Hazardous To Your Health" with the "Oh you're smooth alright, I mean really smoooooooth" George Hamilton. The other is "A Case Of Immunity" with I believe Hector Eliza...something I can't remember how to spell. Both are fair, not outstanding, episodes I would say.
Season 5 surely began with its share of unusual moments. In addition to the great surprise ending to "Forgotten Lady," Columbo wears a tuxedo in BOTH of the first two episodes.
Doesn't he wear a tux in "Any Port in a Storm"? It's been a while since I've seen that ep, but think he does . . . doesn't he say something about a nephew in a community college taking a heating/air conditioning program and who works as a waiter . . . the explanation for having access to a tux.