i never thought about this before, but it really is true. the 80's and early 90's episodes are very dated already, particularly the hair styles (that infamous 80's "big hair") on the women and that music!
i just love the earlier columbo so much more, before he started playing a caricature of himself. it drives me up the wall when the later columbo exaggerates his new york accent and makes grammatical errors ("i seen it"; "he done it") that the earlier columbo would never have made.