The original version had a pretty messed up ending. You don’t really expect to leave a Schwarzenegger film with a lot of really interesting questions and debates, but this one is ambiguous enough that you look at your buddies and wonder if you watched the same movie. The entire flick plays with our perceptions of reality with Quaid being unsure if his memories of being a spy are real or not.
What makes it confusing is that when Quaid is at Rekall getting the false memories implanted, a Rekall worker mentions something about a blue sky on Mars. Then Quaid goes through all the the shit that he does, and ends up causing a blue sky on Mars. So was all of the film his ‘Secret Agent on Mars’ dream that was implanted, or not?