 SPOILER: In one sequence Red Skelton (qv)s character is trapped  inside a house by a large dog. He escapes by removing the hinge pins  from the door, picking up the door and, as the dog comes inside he  holds the door between them and goes out. Red said that they had  written themselves into a corner and could not come up with a way  for him to get out. They were going to scrap the scene when the  comedian Buster Keaton (qv) visited the set, took one look and  told them how to do it.