Thank you for breaking this up Harry. I hope we come up with more. Still don't get: why Herb plays Shadow of Your Smile all the way through exactly on mono and stereo, and then changes the last phrase.
I think I just found another one - at least it's not mentioned here.
"Butterball" from the WHIPPED CREAM & OTHER DELIGHTS album has a difference between the mono and stereo mixes. On the stereo, when it gets to the dixieland clarinet part in the middle (around 1:00 in), Herb joins in with a trumpet solo. Much of that solo is missing in the mono mix.