I actually found a "repeat" in two of the strips. They are similar in nature, but the finish is different. As far as I know, this is one of the only times this happened. If I find more, I'll post them.
Charlie Brown was a bit rude and uncaring in his early days. Perhaps that's why the other kids pick on him now? Because they remember the "good old days" of Charlie Brown? Later, I discovered that Charlie Brown's feelings reflected those of Charles Schulz' feelings towards his younger relatives.
And finally, Violet stopped making mud pies for everyone. I guess kids were really into them at the time.
Next page--Lucy's first appearance, and the kids get older!