It looks as though Charles Schultz's Peanuts characters were some sort of inspiration for some animated segments -
- One girl asks her sister, who's watching TV, if she knows what it's like to be scared, but she claims she's not scared of anything. The first girl dons a scary mask, which, sure enough, frightens her sister, who just responds "Far out!". I can easily see this as a scenario with Marcie and Peppermint Patty, plus this cartoon has plenty of dialogue to make up a full four-paneled daily comic strip.
- A toddler tries climbing a flight of stairs, but he learns how to make it from one step to another all by himself. The young child sort of looks like Rerun, the baby brother to Linus and Lucy Van Pelt. Incidentally, the soundtrack for this cartoon, which is a jazz piano and percussion score, sounds very reminiscent to Vince Giraldi's music in some of the "Peanuts" TV specials.
- This one is likely no coincidence. It's a Cliff Roberts animation with a little boy drawing a self portrait of himself on an easel. He turns the picture around for us to see the side by side comparison, and the boy just says "Me", with the accompanying sight word appearing on screen. It's not hard to notice that the boy in this cartoon resembles none other than Charlie Brown! He has a round head, very little hair, and is wearing a shirt with a zig zag stripe across the front. Those cannot possibly be any more similar physical descriptions of Schultz's best known character.
Also, Charlie Brown's dog, Snoopy, was seen twice in the background of that early "Round" film, that was part of the "Sesame Street" sales pitch. One scene shows a yo-yo in motion winding itself up and down the string. Behind that action is a decal on a wall of Snoopy, posed as if he's happily hopping. If you look very carefully in a very quick footage of a boy standing at a pool table playing billiards, you can see the same image of Snoopy far off in the background.