I've always wondered if Roger was part of Kepple's back up plan from the start in case the Police came after him. There's Kepple's impersonation on the telephone to Mrs Norris which does sound a bit like Roger and then Mrs Norris is asked to meet at the corner of Valley and Magnolia. We later find out that Roger moonlights at the Magnolia theatre to make a little extra money. Coincidence ?

I think if Kepple hadn't got away with making the murder look like a random act then the finger of suspicion would very quickly have been pointed at Roger as the so called spurned lover.

I've mentioned it before, but I think Bart is nearly the only married killer whose wife or husband isn't seen. But he's definitely married because of that one line about Tanya.
I never thought of it before, but maybe his wife was edited out just like Tanya herself. (If so, the actress didn't make it to the credits, unlike Arlene Martel.)

I always thought this episode was overrated. The second murder was one of the most unrealistic in whole series. There is no way he could walk in and out of the theater and projection room without being noticed. I'll take Death Lends a Hand as my favorite episode with Kulp.

As much as I like the other actors, I think Louise Latham's second scene really stands out. I always like that smile she gives when Columbo tells her he believes her by saying "My wife could come up with a better alibi than that."