Yes, I was told visual learning is a trait of AS. My son is often not good with verbal instructions, but can handle them if written down. In particular it is multiple instructions. He also hesitates to ask for help, so I have had to work on him that it is ok to ask if you're not sure, otherwise he just sits at his desk at school and can't remember the auditory instruction and doesn't speak up.
I think what you are talking also extends into the area of taking language literally. Often an AS child can't cope with our metaphors and idioms, or they can't pick up our speech intonation that indicates what we mean depending on the different emphasis of the words. Awhile back I was telling my son off for not going to sleep and said that he'd be "shot in the morning" (meaning sleep deprived, of course!), only to come back five minutes later to find him sobbing, and when I asked why he said, "'Cos I thought I was going to get killed!" (poor little kid!).