It kind of lost me when... (spoilers)

when Tommy recognized his cell donor's mother. How is that supposed to work?

I'm not sure he quite understood who the old woman was (or he wouldn't have been shocked when he saw the images on the laptop), I believe that he had subconsciously recognized in that woman features similar to what he saw in the mirror each day. Some boys look like their mothers a lot. So her face looked oddly familiar to him, as if he had known her for a long time.

why is he attracted to his cell donor's lover - memories again?

I have seen this discussion on another thread, and the thing is not that she had taken care of him, but how she did it. She saw in him her lover (not always, which is why she was conflicted), and her body must have generated a whole mess of pheromones around the kid.
Besides, thinking about it now, I'm not even very sure that he was attracted to her properly speaking. His odd gestures may have been simply the way he was taught to show his affection - and he certainly had affection for her.

there's a highway that is curling up like smoke above her shoulder

I don't want to be mean to the OP but the above post is spot on, you simply misunderstood the whole Tommy 2.0/Rebecca relationship.

A great subtle scene that reflects the intimacy that Rebecca shares with her son is the bit where she is nuzzling his neck. Young Tommy 2.0 stops what he is doing and clearly shows signs of being uncomfortable. Tommy 2.0 doesn't have feelings for his mother but is rather confused because of how he was always treated by her. He loves her- just not in a sexual aspect. There are scenes that almost depict a kinda Oedipus Complex but I chalk that up to nothing more than a blurring of the lines on his part of what is acceptable between a mother and son. (I think he catches himself in the fishnet scene and has to try to figure out what is he doing and if it's wrong or not.)