randomWalks

Wikipedia: The Beatles' "Hey Jude":

That the Beatles selected their first take as the master became even odder when Ken Scott, the engineer in charge, realised that John Lennon had shouted "fucking 'ell!" 2:58 into the song after messing up the backing vocal. Scott later explained, "I was told about it at the time but could never hear it. But once I had it pointed out I can't miss it now. I have a sneaking suspicion they knew all along, as it was a track that should have been pulled out in the mix."

This is quite audible if you listen for it. Only recently have I discovered that Wikipedia is a fantastic resource for music information and trivia.