The techinique of using subliminal cuts would not have worked as shown in this episode since the audience would be aware of individual frames spliced into a film. In the original experiment, conducted by James Vicary in 1957, a tachistoscope (specialized and separate projector) was used, projecting a message for an interval of only 1/3000th of a second; such a brief period that only the subconscious mind could be aware of it.
Dr. Kepple: Your innuendos keep clumping through our conversations like hob-nailed boots.
Columbo: I had an uncle who made a killing in real estate up in San Dimas. Know what he did before he started sellin' dirt? Drove a school bus. Now he owns a ranch, a couple of Cadillacs, sends out embossed Christmas cards.
Dr. Kepple: I know one thing, Lieutenant. You have to admit it. You never would have solved it without using my technique.
Columbo: That's right, Doc. If there was a reward I'd support your claim to it.
Columbo: That's why the barrel and the chamber were clean when Ballistics checked out the gun. That's a lovely touch. A converter! I never figured on a converter.
Dr. Kepple: In that case I'm deeply grateful for one thing.
Columbo: What's that, Doctor?
Dr. Kepple: That you've established that White was killed between 7:30 and 8 because you and I have been together constantly since 7:30, starting in the cutting room and ending, I hope, now. Otherwise I'm positive you'd still be accusing me.
Columbo: Well, Doctor, I've never accused you of anything.
Dr. Kepple: I'll ignore that because I'm convinced that my only real protection in this matter is the fact that you personally are my alibi.
Columbo: And that's a tough nut to crack.
Dr. Kepple: That's not tough. That's impossible.
Columbo: Can anyone confirm that?
Mrs. Norris: No.
Columbo: No one at all?
Mrs. Norris: Nobody at all. Which means that I don't have what you call an alibi.
Columbo: Oh yes you do, Mrs. Norris. You were at the corner of Valley and Magnolia.
Mrs. Norris: With nobody to prove it.
Columbo: Well, I didn't say you had a good alibi but you do have an alibi.
Mrs. Norris: Lieutenant, I didn't kill my husband.
Columbo: I believe that.
Mrs. Norris: You do?
Columbo: Yes, ma'am.
Mrs. Norris: Why?
Columbo: My wife's got no head for crime. We go to those whodunit movies. She always picks the wrong murderer. I want to tell you something. If my wife decided to murder me she could come up with a better alibi than you got.
Mrs. Norris: Thank you.
Columbo: You're welcome.
Apparently the scene or scenes with the character Tanya Baker were edited out of the finished episode. Arlene Martell is listed in the credits as Tanya Baker, yet this character is only referred to in the episode, never seen.
This is the third of Robert Culp's appearances as a murderer in the original series (and his third out of four if you count the entire series). This makes him the first actor to hit this record, although Jack Cassidy would tie him three years later in "Now You See Him."
Columbo mentions "the Hayward case", as in Sen. Hayward in the previous episode "Candidate for Crime"; one of the few times an episode refers to a previous episode.
90 minutes long.