Thank you to confirm about those extra pieces. The season four under the dashboard, where the TV is, has a mini disc reader, at least the piece look like so. Another thing that is different during the season is the center console, where all the buttons are. I think Aoshima used for reference the K.I.T.T. that was displayed at Universal Studios, because on the under body and body there is printed Universal Studios license.
I would like the Super Pursuit mode kit too, that' is very cool! When I was looking a the instructions, on the first page there is pictures of the different K.I.T.T., also the convertible one, but I think those are from the movie,not kit.
I was able to paint and assemble the wheels yesterday.