What the sequel would have been about...Everything that happened was real. Quaid and Melina are living happily on Mars. However, Quaid has been having nightmares, and they're about Hauser. He wants his body back and tries to by controlling Quaid's "body". Almost like a Jekyll-and-Hyde scenario. Richter is probably still alive, and wears robotic arms. He becomes the new Big Bad.
Recall is an early implementation of Dollhouse technologyBefore it causes all the trouble on Earth. Maybe it was Quaid's failure to go back to his original personality that made them create the call-and-response feature that keeps dolls in line.
The Rekall "secret agent" vacation was not a coincidence, and everything is real. It was how they planned to activate Hauser all alongThe plan was for him to lead the Big Bad to Kuato. There had to be some way of activating him after the memory wipe. Unfortuantely, things didn't quite go according to plan.
Kuato is a descendant of RL Jordi Pujol i Soley, President of the Catalonian Autonomous Community between 1980 and 2003.Come on, look at him. The resemblance is uncanny.