"Columbo Likes the Nightlife": the toenail clippings in the toilet.
Classic Ted....and the way Columbo obtained the first one was great with the sound effects. And then holding it out a 4th story window and asking the sgt. if he could see this. "No sir" good stuff.
For me it has to be the plunger wine bottle opener that brings down Mr Paul Gerrard. I can never figure out how Paul managed to get back into the crime scene and swap his opener. It just seems strange the way all of the openers were tested and forensics found nothing. I can't see how no trace of poison was left inside.
This may be a bit off base but in Murder by the Book Columbo would have had to get a search warrant to search Franklins bank records. Wonder what the probable cause was for that. ??
Once in a great while you notice the opposite thing, where something that SHOULD be a clue gets overlooked (though I guess sometimes that's because of editing). It's always bothered me slightly that Adrian Carsini buys a $5,000 bottle of wine, knowing that his $5,000 check to Ric won't be cashed. It's too bad that Columbo isn't shown finding out about that - even though he finds out that a bottle of wine can go for that price, I don't think he learns about that particular one. Or does he?
Good point. Along those lines (things that should have been clues), I always think of "A Friend in Deed."
Hugh shows up at the club, clearly nervous or upset, and pulls the police commissioner away from the gaming table to have an urgent private conversation. Later that day, his wife is found murdered. The murder is important enough for the police commissioner to go on television talking about it, yet somehow nobody remembers or reports that strange meeting between the murder victim's husband and the police commissioner on the very day she was murdered.