When young Katherine sits outside sketching her brother in profile as she watches him through the window, she draws the right three-quarter view, yet the camera pan shows that she could only see him from the left rear view and from a lower angle.
In the very last scene of the movie, Cheever stands very still, but the people behind him are in a looped section of film and keep repeating the same movements.
Katherine slaps Cheever's face several times. After she is done slapping him, his obviously phony mustache is slightly hanging off the left side of his face.