In the song "You've Got What It Takes" by Dinah Washington and Brook Benton the last verse was obviously mangled but they faked their way through it with joking and I guess the A&R dude liked it so much he left it in (the A&R dude being Bobby Shad). Also, Ella Fitzgerald's "Mack The Knife" was released even though Ella forgot the words, but she recovered so nicely it was left as is. Scotty Moore's guitar solo in Elvis' "Too Much" wanders off into a different key before Scotty can recover but that was THE take so RCA-Victor A&R man Steve Sholes let it go. This is rare in the music world. Any more examples you can think of, I mean a real OBVIOUS mistake, not just a wrong note here or there? Thanks!