Several people are in studio records/casting call lists as cast members, but they did not appear or were not identifiable in the movie. These were (with their character names): Jay Eaton (Assistant Clerk), Ernie Alexander (Drunk), Charles Arnt (Captain of Waiters) and Gennaro Curci (Greek).
Do you take your parents for a couple of half-wits?
Brenda Farnham: Yes sir!
Stephen Blake: What? Confound it!
Edith Farnham: Brenda!
After the boy drops a Christmas ornament down onto the head of Brenda, the father chases his son Tommy around the tree yelling "Tommy, Tommy". However once the camera switches angle to the top looking down on the tree Brenda and Tommy point up to see the boy who had thrown the ornament and Tommy throws his own ornament up to the boy. At that point the father is heard yelling "Jackie." This is the actor's real name not the character's name.
Opening credits are shown over a snowy, winter scene, a reference to the lodge where the story takes place.