Despite its many mind games, Total Recall was a fairly linear film. You had the three-breasted woman, Kuato, and the scene where Arnold's eyes almost carom out of his melon. That said, Schwarzenegger's DVD commentary of the film is there to clear up absolutely any plot confusion you may have experienced. Listen to his dulcet, Styrian voice narrate exactly what is happening in every scene. Big ups to Hatman.
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The commentary Schwarzenegger did with John Milius for the Conan DVD (released in 2000, but I'm pretty sure it carried over onto subsequent releases) is nothing short of brilliant. Essential viewing.