In the beginning, Mike draws a gun and the whole scene is dead just to bring the protagonist into the scene. Everything after that is a realistic dream that takes place in the protagonist's heart. The ending is not mentioned, in order to highlight the theme "Who you are depends on your heart".
Two details imply this:
1. Before the male protagonist was finally rescued and half awake, the words that echoed in his mind were the last words Mike said to him before Rekall was injected. This is the last sentence in the real world, which is why he remembers it so deeply.
2. There is one more detail that I remembered then, and now I forget...Khan
Also:
I always saw Kate Beckinsale in the film as Victoria Beckham from beginning to end...
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