Continuity mistake: Just after the fight between Ralphie and Farkus starts, there is a shot of the two from the side and already there is quite a bit of blood on Farkus's face. But then in a shot from over Ralphie's shoulder, there is no blood visible on Farkus's face at all. (00:57:35)
Continuity mistake: When Farkus grabs Schwartz and tries to make him say "uncle", the end of Schwartz's stocking cap is hanging loose in front of him. But in the following shot - showing Farkus throwing Schwartz to the ground - the end of the stocking cap is behind Schwartz's back. (00:23:00)
Continuity mistake: In Miss Shield's class there is a roll of scotch tape that is hanging over the edge of a box. A few seconds later, it's moved further on back of the box and not hanging over the edge as much.
Continuity mistake: In the very beginning the camera is panning, showing Ralph's house next to an empty lot and continues past, showing that across the street is a corner house with hedges. So Ralph's front window would be staring up a street and a line of hedges running up the street. When his father wins the award, the neighbors have their backs to the hedges with the large white house in back of them. This would have them staring across the other street, not at Ralph's house.
Continuity mistake: First breakfast scene, the stack of toast moves from Randy's end of the table to Mom's end.
Continuity mistake: When Ralphie and Randy go to see Santa (after the parade), their parents leave them alone to wait in line. Listen carefully to Santa in the background. You can hear him mention a boy who's wet and saying to get him off his lap as Ralphie and Randy go to wait in line. This is the same boy who we don't see until Ralphie and Randy are on the stairs leading up to Santa.