So many times over the years Bye Bye Sky High IQ Murder has made me think of Roddy McDowell in the cable car with the cigars over the floor rather than the actual episode. Also I find it difficult to remember which Jack Cassidy author episode is which.
"A Friend in Deed" is a catchy play on words. Indeed --> "In Deed", as in both friends helped each other with a very dirty "deed".
As already mentioned above, "Negative Reaction", "Suitable for Framing" and "An Exercise in Fatality" are excellent. And don't forget about "Any old Port in a Storm" (port wine play on words).
I never liked the title "Murder Under Glass", never made much sense to me.
I don't usually watch the later episodes. But the one that I do watch is "Uneasy Lies the Crown". I enjoy that one and it took me awhile to figure out what the title meant but did figure it out.