Visible crew/equipment: Towards the beginning of the movie when Ralphie's dad is in the basement fixing the furnace and the entire family is staring at the door, you need to keep an eye on the left side of the screen. There is a crewmember in the family room, who is on the screen by mistake. You don't see the person right away, but it is in that sequence when you see the mom in the shot, then you can see the leg of the person very quickly in the background.
Visible crew/equipment: As the buck teeth are being handed out at the beginning of the classroom scene, the camera pans to follow Miss Shields and you can very briefly see the shadow of the boom microphone on the wall at the top of the screen. (00:15:00)
Visible crew/equipment: Right when Adult Ralph says "A C+?", Ralph looks from his paper to the blackboard. Near the bottom of his rights glasses lens, you can see a stage light reflected in it, as well as the silhouette of a crew members head. Do not mistake it for the classroom light reflected near the top of the same lens.