One of my favorite Columbo lines. (not verbatim)

Mayfield "maybe she knows more than she's saying"

Columbo "actually sir I think she knows less than she's saying"

I've always liked the moment when Mayfield gets furious at Heideman for not telling him about being brought to the hospital by ambulance an hour before. I had a similar question about THE MOST DANGEROUS MATCH, but I always like to think of that as his last little moment of genuine concern for Heideman, instead of an act.

Mayfield's killing of Harry & framing him to look as though he had gone back to drug taking is maybe the most truly evil murder in all of Columbo.