The T600 that Marcus enounters in LA near the start does have rubber skin on (albeit badly damaged), and is mistaken for a person by him. Teenage Kyle, however, spots it easily - so that ties up to a passable extent.
After all the bad press, I expected this film to stink (watched it last night), but I actually rather enjoyed it. Better than T3 by some margin, and a few terribly cheesy moments aside ('Jumpstart my Heart', and 'field hospital heart swapsies'), it wasn't half bad IMO. The kid playing Reese looked nothing like Michael Biehn, buy he got the voice down perfectly. Bale wasn't very good IMO, but something about it hung together and it pushed my geek buttons in a way I really didn't expect it to.