Walsh also provides the film with a few comic moments. Being that I have already said that one of the film's main themes is the possibility of error, specifically in committing a crime, think about the frightening possibilities of the following situation. You think you find a person who is dead, but he or she might not be. You try to clean the mess up, but no matter how cautious your efforts, blood inevitably emerges at some point. In your cover-up, you think that you haven't left any racks, but of course you do, both literally and metaphorically.
Oversights surface everywhere.
And when all is done, you think you know what really happened to begin with, but you are dead wrong. In fact, no one directly involved knows for certain what went on in the entire duration of the crime. Their gradual realization of the truth is one of the things that makes this film so much fun to watch. The plot and characters - All of the events in the film are executed with utter precision and with careful consideration for timing. I found the plot as well as the characters all to be very believable.