Revealing mistake: When the boys' rival team challenges them, all the boys throw their gloves down, except Yeah-Yeah. When they all go to pick them back up, Yeah-Yeah has to pretend to pick it up.
Revealing mistake: When the kids are at the pool and Squints has just jumped in the deep end, the other kids go crazy and then you can see water on the camera.
Revealing mistake: When the Babe Ruth ball is thrown to Smalls, smoke from a ball launcher is visible before Smalls hits it.
Revealing mistake: When Benny jumps off the fence, it's obvious it's a stunt person doing it instead.
Answer: It's a blue hat with a yellow/gold capitol "C" for the logo, which doesn't correspond to any major league teams. It could be a minor league or school team hat. Benny refers to it as his "old" hat, so he may have replaced it with the Dodgers hat he's wearing.