Visible crew/equipment: When Quaid and Melina hop into Benny's cab and are being chased by Richter, watch Benny. During the shots where the perspective is from behind Benny, you can see that it is a stunt driver in the car. His head is shaved neatly, yet Benny's hair is curly and frilly all over. (01:11:00)
Visible crew/equipment: When Bob abruptly leaves his office due to Quaid's schizoid episode, a boom mic can be seen in a reflection on the glass, immediate left. (00:18:35)
Revealing mistake: When Arnie uses the dead body as a human shield, watch the corpse's mouth - he grimaces every time he gets hit (the squibs hurt). (00:31:00)
Question: There is a scene in the movie in which Arnie disguises as a woman to pass the entrance control in Mars. Moments later, the mask he's using starts to malfunction and he has to take it off. When he's doing that, we can see that the man who's playing Quaid is not Arnie but a stunt double. Why did the director choose a stunt double to replace Arnie in a scene that's not risky at all?
Answer: It's not a stunt double, it's a mannequin (fake head actually) of Arnie, used for the artificial head shot.
Grumpy Scot