There is strong evidence that the entire movie may have been the virtual "trip" by Doug Quaid. The memory Rekall chooses for Quaid is called "Blue Sky On Mars", and monitor previewing the memory feature the generators revealed later in the film. How in the world would Rekall know about the generators - it's too strong a coincidence, especially since the movie ends with blue skies on Mars. Moreover, after Quaid advises Melina to kiss him before he wakes up, the movie does a fade to WHITE, which is usually reserved in films for people awakening from a dream. In short, yes, the entire film after Quaid enters Rekall was indeed just a memory trip.
Don't be sad - Philip K. Dick loved fooling the audience, especially when they didn't realize they were being fooled!
Don't be sad - Philip K. Dick loved fooling the audience, especially when they didn't realize they were being fooled!