"Alternate version" studio chatter

[loganjlr]

In certain alternate versions of tracks, you can sometimes catch the artists on the mic either counting down or conversationally riffing in the booth before they start the song.

One of the examples which inspired this thread was the alternate take of Martha & The Vandellas' "Love [[Makes Me Do Foolish Things)" where you hear Martha quip "Maybe if we knew what it was you were stopping the tape for, we could like.." then you hear her trail off with a chuckle. In The Supremes' "Extended Alternate Version" of ""You Can't Hurry Love," you can also hear [[who I believe) was Diana laughing and sniffing before the music starts.

Where these unrelated impromptu recordings spliced into the take to make it seem more realistic, where they planned, or where they legitimately the artists just joking around?