Same thing here. Woodstock gets in on the action.
That said, there are several perennial Peanuts characters that never show up in this episode ever: most notably Peppermint Patty and Marcy. I guess they didn’t wanna touch the LGBT demographic back when this was made. 1972. I looked it up. Charlie Brown is older than me. I guess he’s probably in his fifties now. Geez. I guess Snoopy is long gone, then.