Did they play with the expansions or vanilla 1st ed? If the latter:
-6th player (Martell) and new layout of the southern areas
-New House cards (both strength distribution and abilities)
-Special Consolidate can now be used for mustering in the area
-Special Raid can remove Defense orders
-Wildlings' deck instead of fixed reward/penalty
-Addition of choice in the Westeros cards
-Garrison in the main House area
-1 more Knight unit limit
-Little but meaningful differences in the board (Kingswood has 1 supply, Sunset sea not bordering Highgarden, Oldtown is now a Stronghold)
Pretty sure they have only played vanilla.
Thank you for the list.