I don't know if this counts, but doesn't the 'DIRTY HARRY' soundtrack have some chatter after the flubbed take of the "Scorpio" music at the end of the disc? I think the vocalist laughs and apologizes after her voice breaks....
(Or maybe you just count this as an EASTER EGG.)
That's the Aleph label release of the complete score (Schifrin's CD label).
A few of the early Cinevox lps had chatter in between the tracks, following some takes, due, it seems, to a little too much pasta & red wine and not enough attention to the actual editing.
Not sure if Goldsmith's message at the end of ALIEN NATION counts, but I love it just the same.
Then again, he does mention 'equipment's broken down...' and it is an electronic score, so I'm gonna go ahead and assume it counts.
That's my favorite and it cracks me up every time. He just sounds so defeated. I always think about that quote when Im having a bad day at work or something.