god bless all of you...ive only spotted one goof so far and then saw it on this webpage...the one in etude in black at the end where the wifes hair is up in a bun and when she goes in the studio, her hair is in a ponytail...im guess im not very observant!!! ill keep trying
there is also a weird hair thing in "old fashioned murder." when columbo meets janie in the living room with ruth, her hair is very curly. in the next scene, ruth takes janie to the museum to do inventory (and have her discover the body). janie is wearing the same clothes, but her hair looks very different--much straighter.