Stupidity: There is no way Mr. Mertyle did not hear the fence in his backyard crash to the ground; there's also a likely chance he could hear his dog crying and Smalls saying the dog is hurt. Even if he could ignore the sounds of other attempts to try to get the ball back; with the fence coming down where his dog lives and the chances of an injured pet it seems far too unlikely he wouldn't have rushed straight to the backyard hearing this.
The Sandlot (1993)
1 stupidity
Directed by: David M. Evans
Starring: Chauncey Leopardi, Tom Guiry, Mike Vitar, Patrick Renna
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.
Hamm: Hey, do you want a S'more?
Scotty: Some more what?
Hamm: No, no. Do you want a S'more?
Scotty: I haven't had anything yet, so how can I have some more of nothing?
Hamm: You're killing me Smalls.
More trivia for The Sandlot
Question: Benny gave a hat to Smalls to replace the fish hat. What team and what year was the hat?
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.