Hmm. I'm not sure that anything in the book would be surreal in the traditional sense of surrealism, as it's all part of the text.
I.E. the dogshit scene. While it challenges reality, it is known to the reader that it is a mental state of the protagonist, and the protagonist himself is aware enough to be concerned about his inability to "see" clearly enough to discern whether he is in fact hallucinating.
Traditional surrealism (bunuel, et al.) is - without trying to cheapen it - a running gag designed to play with the audience - the players themselves rarely, if ever, show that they are aware that their surroundings are anything but normal.
For me, much of the thrill or enjoyment of the novel (or any film) comes from the feel of the cinematography - the texture, if you will. Take, for example, the imagery of the muscle cars in the book. While not the focal point, you can certainly imagine a muscle car with balding tires and a couple dents - a rough spot on the left rear fender starting to rust. Imagine sitting in the passenger seat on a hot day with no A/C, sweating and sticking to the black vinyl as you scrutinize the text "OBJECTS IN MIRROR ARE CLOSER THAN THEY APPEAR". Your eyes flick past the slightly bent telescoping radio antenna, rove to the dash, which is covered with a thin layer of dust, and end up on the 5 button radio with 8 track. The keys hang from the chrome plated ignition cylinder, and a red light on the instrument panel - barely visible in the sunlight - blinks out some warning or another.
Some cinematographers (and authors, which unfortunately I am not) can describe that scene so vividly that you can smell it. Now imagine the same scene has been covered up with a thick layer of paint.
I'm not saying it won't be good, and I will reserve judgement until I have seen it, but my gut instinct tells me that I will not like the animation. And yes, I do enjoy some anime.