Revealing mistake: Upon docking the Palomino to the Cygnus, the small ship is then carried "down" to where the crew can disembark. As the Palomino is carried along, the camera follows it linearly, past the superstructure of the Cygnus. The star filled background also shifts position slightly in exact synchrony with the motion, revealing that the background is really just a short distance beyond the spaceship miniature.
Revealing mistake: At the start of the film the Palomino goes into a roll, and the two crew members sitting around the centre console are sitting in standard office chairs. Despite them rolling and hanging on, if you look at the bottom of the chairs they're not secured to the floor, instead the actors are pushing half of the feet off the floor.