In this scene, Walter Mitty is the commander of a fighter jet represented in World War Two. He ends up saving the day and is the hero in this story of his imagination.
In this scene, Walter Mitty is the head doctor talking to a patient before having treatment. Once again in his imaginations, Walter has a pretty exciting thing going for him.
In this scene, Walter Mitty is about to face a firing squad concluding his imaginations. This could connect to the time and place of World War Two because people don't usually see firing squads around anymore.