I always thought there was a major loophole in that one: Columbo notices that the telephone light does not work at Milo Janus house (the murdered removed it to make believe that the recorded call came from the outside whereas it came from the internal line of Janus desk), and it should have given him the idea that he was playing the recording from inside the house.
A quick check at the telephone company (he often does that in many other episodes) would have proved that the call was a fake one, no need to check for the way the laces are tied (one user noticed that the victim is left handed, if that's right there's a goof here anyway)
Anyway, very enjoyable, to be watched again and again. One of the rare episodes where Columbo does not try to trap the suspect, and a very "life-like" murder. No guns, elaborate poisons, heat blankets ...
A quick check at the telephone company (he often does that in many other episodes) would have proved that the call was a fake one, no need to check for the way the laces are tied (one user noticed that the victim is left handed, if that's right there's a goof here anyway)
Anyway, very enjoyable, to be watched again and again. One of the rare episodes where Columbo does not try to trap the suspect, and a very "life-like" murder. No guns, elaborate poisons, heat blankets ...