Most recent old ep I saw that I remember, there was a chloroform store with bottles of chloroform, up close, they each had a scribbled "chloroform" label on them, but they edited and lazily scribbled out the word on the bottles with a slightly different color at that, except for one angle when Homer's holding a bottle and they didn't scribble out the edge. Not the best example, just can't recall others. Scenes are completely cut, edited, removed.

Other shows have similar, there was an American Dad ep from the early seasons on replay now, news headline in the intro credits said a pro-union joke and they just whiteboxed over the headline.

Not that it's a new concept for them, apparently the original The Santa Clause movie had a 1-800-SPANK-ME joke I recall hearing as a young, that they edited out on the second VHS run of the movie and all subsequent runs.