'Dark Side'9, YouTube

One of the uncredited voices on the tail-end of the song,"Money" was that of Henry McCullough, a former member of Wings (1972-1973).

Henry McCullough, credit Ronnie Norton via henrymccullough.com

At the end of the song there is a voice speaking the lyrics, "I don't know; I was really drunk at the time" that's Henry McCullough who is rumored to have been talking about a fight he apparently had with his wife.

Oddly enough Paul and Linda were initially in the recordings as well, but Henry was the only one from Wings who made the cut. According to Roger Waters in an interview people were hanging around the Abbey Roads studio get small parts in the song, the McCartney's were thought to have been trying to hard to be funny so they got the edit.

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"Money" with Henry McCullough (Paul McCartney and Wings):