The programmable Accutrac 2000 turntable used in the murder plot was the first example of a brand new and important technology. As an arm scanned the width of the record, an infrared light beam was bounced off the surface and the returning light intensity was read. The turntable was thereby able to measure and store the location and width of each individual track, allowing the user to play only those tracks he wished to hear. This technology would eventually become the method by which vast amounts of digital information could be read using a reflected laser beam, leading to laser discs, CD's, CD-ROM's and ultimately, DVD's.
(Columbo is informed that all of the club members rate in the top 2% of I.Q.s)
Columbo: Well, what do you know. Here I am talking with some of the smartest people in the world, and I didnt even notice!
Columbo: When I first joined the force, sir, they had some very clever people there and I could tell right away it wasn't going to be easy making detective as long as they were around. But I figured if I worked harder than they did, put in more time, read the books, kept my eyes open maybe I could make it happen. And I did. And I really love my work, sir.
Oliver Brandt: I can tell you do.
Columbo: When the squib goes off it produces vibrations and that knocks the book down. That Danziger is a genius!
Brandt: Vibrations! That nitwit! The man who conceived all this, you make him out to be a bungling ass! No! This is what he would have done!
(Columbo walks into a restaurant carrying a donut)
Waitress: You buy that here?
Columbo: Uh, no. I bought it from the donut shop because I was going to eat it in the elevator. Then I saw my friend here and, uh... (she glares at him) I'm really terribly sorry.
(He wraps the donut in a napkin and gives it to the waitress who hands him a menu.)
Columbo: (looking at menu) Well, let me see, uh, um, let's see now.
Waitress: I can come back.
Columbo: No, no, no. I'll have, uh... I'll have a donut.
The portrait of the fictional Mrs Melville from the first regular episode "Murder By the Book" can be seen on one of the walls in the club living room/meeting area.
90 minutes long.
The name "Danziger" was the name of the killer (played by Robert Vaughn) in the previous episode "Troubled Waters" filmed two seasons earlier. No relation, presumably.