My wife is a music nerd, so I asked her this question. Her answer: Summer Nights from “Grease”. The entire song is perfect for what it is, except for the very last word. John Travolta switches to his falsetto range to sing the word “nights” in a style that reminds me of the Bee Gees, and it just doesn’t fit with all the vocals that came before it. It’s literally a sour note to end what’s otherwise a perfectly good song.

Method Man is one of Wu-Tang’s best rap songs but it starts with a lengthy and disturbing section where the various members take turns describing how they’d torture people. Method Man ends the section with arguably the worst method.

It’s pretty neat I guess and is supposed to show you how depraved Method Man’s character is supposed to be. But when you listen to it like 20 times it just gets old fast. I don’t wanna hear about rusty screwdrivers again…

Highway 61 Revisited could have been my favorite Bob Dylan song, except for that damn slide whistle.

Pretty much any song with a rap feature. It’s not that I don’t like rap, it’s that the feature doesn’t work well with the song most of the time.

I think a good overall example is Tove Lo - she has many features present across her albums and there are only a couple that truly “fit” the song.

There’s another part of Schaffer the Darklord’s “The Rappist” where he talks writing in pencil so you can erase it, and the burn is good but the flow with and surrounding it is only mediocre to me lol. Otherwise a phenomenal song with strong lyrics and flow throughout, it’s just that one part where, well, he needed to take his own advice ;)

Not many though, I really had to nitpick to think of these examples.

Almost all the songs I know of that are good, except one part, generally the bad part is just random noise or repetition at the end of the song that just grates on you the more you hear it.