I kind of agree about Raymond, but Maurice Evans was very good at playing impatient characters (he played a very serious one in PLANET OF THE APES, and some others), so maybe they couldn't resist having him play Raymond that way.
I think he was also still upset about the previous evening, when all the police (including Columbo) were there and that created a lot of work for him in order to clean up. And, if you ask Mrs. Peck, Columbo is not exactly the tidiest person in the world and to have him - of all the police - return the next day, doesn't exactly make Raymond happy!
I always like his line when Columbo can't figure out the pen - "Simplicity itself!"
Maurice Evan's little delivery of that line is great.
Yes the clue at the end is a little bit absurd. Because there's a thousand reasons why she's not in the filming room not that she's upstairs in her husband's room firing a pistol
Love the episode despite its flaw in the clue because the performances led by Janet Leigh is what sells everything. In the hands of another actress maybe Grace would have come off differently, but it's the fact that I saw in Grace Wheeler the same damaged innocent quality Janet brought in "Psycho" that sold me completely, combined with the heartbreak so obvious in John Payne's performance.
I was glad at least in the world of fanfic I was able to get Dr. Beckett of Quantum Leap to "set right" the story of Grace and Ned. :)
I also get a kick out of the fact that the pairing of Maurice Evans and Linda Scott as a married couple is the only case I know of where a former Batman villain (the Puzzler) is married to a former Batman henchmoll! (Scott was a Riddler henchmoll in one episode).