Total Recall (1990) - 3 questions

Question: Throughout the movie it's suggested that Quaid/Hauser isn't experiencing anything at all and what he's experiencing is in fact a memory implant. My questions is, did the events actually happen or were they simply the memory implant Quaid purchased at Rekall?

Answer: Its left deliberately ambiguous for the viewer to make up their own mind about what's real and what's fake.

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.

Question: At the beginning of the movie, Quaid has a friend at work (if my mind's not failing me his name is Harry) that tells him not to go to Recall because some person got lobotomised. Later, when Quaid is returning from Recall his friend stops him and tries to kidnap (or kill) him because Quaid "talked about Mars". I can't understand the role that this man has in the plot. Quaid told his wife that this man is a spy (I wonder how he knew that), and I'd like to know which side he seems to be fighting for (the Agency or the rebels).

Answer: Harry works for the Agency the same way Arnie's wife did. While the wife watched him at home, Harry was to watch him at work. Harry told Arnie that story to keep him from going to Recall and to keep him from having to kill Arnie for bringing up his memories of Mars.