When Marty first appears on screen, he is sitting in a director's chair and drops his script on the floor. In a subsequent shot moments later, it is mysteriously back in his chair.
When Johnny Swoonara arrives there is a shot of Commander Shore and Troy and some of the confetti falls on the inside.
The blood effect at the beginning appeared to be achieved by painting a bright red stain on Troy Tempest's uniform; even for the movies, the uniform should have a bullet hole in it.