Looks like a great (and cold!) trip!
On the 1 free beer in Plus on the domestic leg, I am pretty sure that it is indeed Norwegian law. They have strange laws on alcohol, and until a few years ago also banned earning points/miles on domestic flights.
You would have noticed that all your international flights on SAS Plus would have free bar for all you would want, so not entirely fair to blame SAS for that (although there are other things which are fair to blame them for

)