When Jenny goes to see Ronald at his house, it is pouring rain outside. Jenny's hat is full of water, but her hair and coat are barely wet at all.
When Ronald and Jenny get up off his couch so Jenny can leave to catch her train, the camera tracks to the right and its shadow falls across a column in the foreground.
When Ronald is introduced to his class, a shadow of the boom microphone moves onto the blackboard upper left of the frame.
Several people compliment Douglas on his charming British accent--but he doesn't even attempt one.