The various characters are picking up quirks that help to differentiate them. In the near future:
Lucy is a reader, but also gets facts wrong readily and laughs off suggestions that she might be wrong. Charlie Brown, on the other hand, when he gets something wrong he's very self-conscious about it, and Lucy's continued willful ignorance will give him ulcers. Linus, even when he starts really talking, is pretty quiet. Patty and Violet aren't that different, but Violet is more antagonistic, cold, sometimes even hostile to Charlie Brown. Schroeder, well, is obvious. Snoopy has problems with inanimate objects.
I think it's obvious that Shermy is in the pool in the first panel, but it's less evident that the kid he's with is Schroeder. It probably is, but that's mostly because I don't think Schulz would throw an extra in there just to have one.
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