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).
Tommy Blake: It's a dog. Whaddya think it is?
Brenda Farnham: It's a funny kind of a one.
Tommy Blake: It isn't either funny. It's a genuine St. Bernard
Brenda Farnham: A St. Bernard? Why, a St. Bernard's a mammoth big dog.
Tommy Blake: Well, the man said the California sun kind of withered him a little.
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.