Check out the viewer comments to find out how the producers managed to get three versions of Bette Midler in front of the camera...
-NW

Bette Midler • “Boogie Woogie Bugle Boy” • 1973 [Reelin' In The Years Archive]
ReelinInTheYears66
June 30, 2024
https://www.youtube.com/watch?v=PPUTtVrfyxE

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Viewer comments:

@Ice_Karma

So much work to produce this (i)n 1973, which most people in 2025 aren't going to appreciate. There was no greenscreen, this was all done with film and travelling mattes and lots of takes. And it looks like a tiny error was left in at the very end to show that Bette was't really triplets -- can you spot it?

@That_AMC_Guy
Very good split screening - but you can see the line very clearly on the right side and near the end, the "Bette" in yellow extends her right hand beyond the boundary and it gets cut off.

@jayluck8047
Shame. Even if there where mistakes in the performance live, even if the laugh track wasn’t there... they did their best to entertain.