Corrected entry: When the treehouse is about to explode, we see Bertram say he's getting out of there and go down the ladder. Then after some scenes we see him running out of the tree house when he was supposedly already down on the ground.
Corrected entry: When Franklin grabs the ball and hurdles the fence, in the next shot we see the dog (a tiny bulldog) also jump the fence and chase him. No dog that small would reasonably or realistically jump a 12 ft fence, even with a very long-running start. It would be physically impossible. This was purely for comical purposes, nothing else.
Correction: Unless you're talking about a deleted scene with a different dog, the "tiny bulldog" is in fact a mastiff. And the 12 foot fence is a 6 foot fence. A mastiff can definitely jump that.
Other mistake: When Benny signs the autograph for the fake baseball he signs it Babe Ruthe with an 'E' on the end. This can be seen when Smalls put it back in his step dad's trophy room.
Suggested correction: He did though it's apparently supposed to happen like that as one of the boys says "Baby Ruthe?" when he's signing it and a comment is made about how bad it looks. Strange as it seems; this appears to have been done purposefully for the movie thus would not be a mistake if that's what the actor was directed to do.
Correction: The tree house has 3 levels. Bertram went up the ladder to warn them on the third level. And is still on the second level as they all exit the tree house.