With so many songs, it’s not surprising that a few of REM’s songs borrow key hooks, etc. from other artists.
Sidewinder Sleeps Tonite - Vocal intro melody borrowed from Lion Sleeps Tonight (credited)
Hope - Lyrical approach from Suzanne from Leonard Cohen (credited)
What’s the Frequency, Kenneth? - I can’t remember the song/artist, but I remember hearing a 70s-ish song that had a very similar guitar melody.
Everybody Hurts - Unchained Melody (Righteous Brothers version)
The One I Love - My My Hey Hey by Neil Young
Chorus and the Ring - Guiding Light by Television