That always bothered me too. Maybe the rock dispensers
knew that was Charlie by dint of his butchered ghost costume- but that's still no excuse. Maybe they were the parents of his long-suffering teammates.

For the last decade or so that CBS had the rights to PEANUTS animation, the "I got a rock" scenes were deleted- possibly due to implications of child abuse.
Even though I've watched GREAT PUMPKIN virtually every year since 1966, I always find new things, possibly because it's only aired once a year. As with most the early specials, the low budgets and adherence to Schulz's drawing style results in poor-to-mediocre character animation of the kids. And except for the voice actors of Charlie Brown and Lucy, the liabilities of using inexperienced child performers for the typically precocious dialogue is very apparent. Cathy Steinberg seems to have particular difficulty with Sally's dialogue, although her rants at Linus ("If you try to hold my hand, I'll slug you!"; "You owe me restitution!") and her quick mood transitions ("Just you wait- the Great Pumpkin will be here! Linus knows what he's doing! [the gang leaves] All right, where is he?!") are quite good.
But these shortcomings are tempered by, among other things, the marvelous WWI-inspired backgrounds and Guaraldi's accompanying 'adventure' score, which is every bit as effective as his more-celebrated jazz pieces. As with the strip, the mid-sixties Snoopy steals every scene he's in. Even when he's not the center of attention, it's fun to watch his facial expressions: after sucker-licking Linus ruins the pile of leaves laboriously raked by C.B., both he and Snoopy sport identical angry, teeth-gritting visages.
The beagle's performance during Schroeder's piano upbeat/downbeat segues is a classic of timing and personality animation. His mortified expression instantly after he submits to his species' instinct and lets out a mournful howl is absolutely priceless.

Even though I'm not a fan of Bill Melendez' sped-up gutteral portryal of Snoopy, it fits perfectly here.
Someone else in this thread asked if anything was cut from YOU'RE NOT ELECTED. I believe there was a scene at the beginning whereby Sally 'brings' her brother to class for Show & Tell. Despite having not seen the special in many years, I recall it depicted in its 'novelization'; all PEANUTS specials had them.