Columbo sprawls out on the pier with his left leg extended beneath him, and his right leg up and bent. Then he instantly switches to having his right leg extended below, and his left leg up - then switches back again.
When Charles Clay and Wayne Taylor leave the Commodore's house turned crime scene, Clay gets into a beige Mercedes-Benz coupe with beautiful wire wheels & practically nonexistent bumpers, yet in the very next scene as he is approaching the guard shack, the car is a newer model such, with more prominent bumpers & plain stock wheels with center color matched caps & ringed silver MB logo.
When Columbo and Lisa are sitting [and attempting] the Lotus Position on deck, the large rectangular shadow in the foreground changes position several times. [PM]
After identifying the body, Columbo puts his arm around Clay's shoulder to lead him out of the morgue. As they turn, the scene cuts to a rear view, and Columbo's hand is grasping Clay's elbow. (He then raises it up to his shoulder.)
When Columbo first pulls up to the Commodores house his car has the top up. When they all go back out front, his cars top is down.
Columbo lights up one of his trademark cigars, then sets off in a rowboat while whistling "This Old Man" - yet he still has his cigar in his mouth while he's supposedly whistling. Although this may seem like an audio/visual mismatch, frequent cigar smokers have often mastered the art of whistling with a cigar in their mouth or between their teeth.
As Columbo wraps up his phone call with Ensign O'Connor aboard Charles Clay's yacht, three people can be seen on the adjacent yacht "Cameo", peering through the windows in the background. They're clearly not extras, since they stare at the camera nearly constantly, only occasionally turning to discuss what they're seeing with each other.
In the last scene as Columbo is rowing away across the bay, the boat is moving faster than the oar strokes could possibly make it go.
When Charles Clay drives away from Otis Swanson's house, his car has wire wheels, but when he pulls up to the guard shack, it has hub caps.
When Swanny is playing the piano at the yacht club, there is absolutely no pretense of his hands matching the music that he is supposedly playing. All he is doing is moving his hands up and down on the keys.
Otis Swanson, a wealthy boat designer, created a beautiful yacht which he planned to name after his beloved young bride (Lisa S.). Rather than hire a professional sign-writer to emblazon her name in gorgeous script and gold leaf, he instead planned to add her name using crude, cardboard crate stencils.
Lisa is shown in what she calls the proper transcendental meditation positioning of her legs. After she tells Columbo he's doing it wrong and then shows him how to do it properly, she simply crosses her legs when she goes back into her meditation rather than assuming the position she just instructed him as to being proper.