How did he get out of his house so fast? How could the characters think they were hiding behind that tiny fence?
The third panel here is most interesting to me, since it depicts three characters running. It's not as easy to depict a cartoon character running, cleanly, as you might think, and those squat Peanuts characters have special issues with it. The general pose these running characters adopt is leaning forward slightly, front leg lifted up and bent, rear leg bent and folder under the body, and arms held out a little with hands crumpled. They are also shown "hovering" in the air. Note that their legs are a little longer when running, so they don't look too strange, but in the last panel their legs must be quite a bit longer for them to be holding that crouching pose.
Note that characters who are actively trying to run lean forward a little, but Charlie Brown, who isn't trying to run very hard because he's not intent on escaping and doesn't know why he's running, is leaning backwards a little. This post also helps to keep him distinct from the other characters, since his head is moved out from behind Patty's. Also note Shermy's pose in the second panel, with his right leg pulling away from the door a little in anticipation of his run. These are the kinds of things a good nuts-and-bolts cartoonist thinks about. It is hard to imagine, say, Scott Adams, whose cartoons are more about irony and banter, and who uses characters mostly as containers for dialogue, it is hard to imagine him spending much time worrying about these things.
Finally, did kids every say "whee" like that?
