I was thinking about it and "Oh Well" wouldn't have fit in a PGSG set.
The song somehow still always fit a Fleetwood Mac set preceded & followed by whatever their then-current material was...whether it be Danny Kirwan, Bob Welch, Christine McVie, Stevie Nicks, Lindsey Buckingham, Billy Burnette or Dave Mason's material. (since a Rick Vito or Bekka Bramlett song never preceded or followed "Oh Well" in a set, they aren't listed)