He very rarely skips or transposes if doing so would make it not make sense. If that ever happens, he immediately catches himself and goes back. So he "hears" himself. But he just zips. I don't have concerns about comprehension--my only slight worry was if this might be some kind of weird vision or processing issue, but my gut says no.

I vaguely recall my DD also doing this at this age. Not sure if she still does or not. I don't think so?

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how are his spatial skills? when he draws people, how detailed are they? Does he like to do I-Spy type books?

Spatial skills are great. Draws nice detailed people, though he isn't as ahead in writing or drawing as his sister was at this age. Great at I-Spy and Waldo--loves them.