In Caution, Murder can be hazardous, the whole business with Wade Anders replacing the cigarettes was stupid. There was no need to do it, or leave a lot cigarette in the victims hand.

I've always thought the stupidest thing a killer ever did happened in Mind Over Mayhem when Dr. Cahill stopped in the middle of staging a crime scene to light a cigar and then throw the match in a clean ashtray.

What about Brimmer in Death Lends a Hand telling Columbo he was ambidextrous and writing with his left hand AFTER Columbo told him the murderer was left-handed? Keep your mouth shut and act like a righty in Columbo’s presence.

Actually, Brimmer's goof was writing with his left-hand after the matter of the killer being left-handed was established which prompted Columbo to notice, "Isn't that something! Here we were talking about the killer being left-handed and you're left-handed!" Then Brimmer switches to his right hand and mentions being ambidextrous. So Brimmer's goof was signing left-handed initially whereas if he had signed right-handed, Columbo never would have spotted the "coincidence".

Yes, that’s right.

Viveca Scott in Lovely but Lethal. Why does she need write those figures on that magazine? OK the murder was not premeditated but why does need to write them down?!

Also Paul Galesko, stupidly writing down the ransom amount but not the address. It makes logical sense to write the address but then he leaves the note behind anyway. Another silly thing to do.

Starting the Tchaikovsky LP in the middle.....