When Lewis has a bad dream, he awakes to see his roommate standing over the bed. As he discusses his dream, his pajama top repeatedly opens and closes as the camera angle changes.
During the autopsy, the professor repeatedly mentions the gastrovascular cavity. Gastrovascular cavities are not found in humans, only in certain animals without true circulatory systems, such as jellyfish and flatworms.
These "college" students are clearly in their 40s.
In the dance scene, the band members' movements have nothing to do with the music played. While saxophones can be heard, the sax players are shown with their instruments on their knees. Later, there is a tune featuring a trumpet, but there isn't even a trumpet in the band.
In the band scene, a piano and clarinet can be heard, but these instruments are not in the band.
While viewing the body of a friend killed in an auto accident, the candle blows out casting the entire room into darkness. After the candle is relit and the boys are leaving, the camera pulls back showing light fixtures lit up in the ceiling.