How many edits of GPCB are there? I remember the 1980's edit cut out the sequences where Lucy and everyone go Trick or Treating, and we don't get to see Charlie get rocks 3 times... The ABC part keeps that in tact, but it omits the scene where Schroeder is playing WWI music, and Snoopy cries, and gets so upset he leaves the party.
Schroeder and his WW1 music making Snoopy emotional has ALWAYS been intact whenever I've seen it, but yes, I have a video tape (taped off CBS when they used to air it) where they cut out most of the trick-or-treating, where they fade straight to Charlie Brown talking about Snoopy in his WW1 Flying Ace guise right after the first "I got a rock" line.
Now, for the Thanksgiving special, I DO know that the current ABC print omits two scenes, and they both involve Snoopy and Woodstock; one of which includes where they go digging through a large chest, looking for the right costumes to wear (and props to use) for their Thanksgiving dinner, and end up in their pilgrim outfits, before they ring Charlie Brown's doorbell. The second is right after Charlie Brown mentions his grandmother lives in a condo, Snoopy treats himself and Woodstock to an actual turkey dinner, and breaks the wishbone, leaving Woodstock with the biggest half. Now those two scenes I remember seeing on the CBS print in the early 90s when I was little, but they weren't on the ABC print, so once I got the holiday boxed set on DVD last year, and saw those scenes again, it all came back to me. I don't know why, but I remember I got really emotional watching Woodstock zipping off in mid air with his half of the wishbone.