Character mistake: Right after the firefighters have removed Flick's tongue from the flagpole, notice the police officer on the left (Flick's right). He is wearing his sidearm on his right but his Sam Browne cross strap is attached to his belt on his left. The whole point of the cross strap is to support the weight of the sidearm, so the officer is wearing it backwards.
Character mistake: Randy is exuberantly laughing as dad comes back into car when Ralphie said "fudge." This is in the young actors anticipating of the mom's reaction yell about "fudge" from a previous take. In fact a "tell" is that Darren McGavin admonishes "Randy" when he gets into the car.