In the episode were Eric and the gang go up to Canada to get beer but get busted because Fez looses his green card, notice a fairly large Canadian map on one of the office walls. look closely and you'll see the Province of Nunavut (located in the North-east of Canada, in the eastern side of the former North West Territories,and to the left of Greenland) Any way Nunavut was just deemed a province a couple of years ago, so this new map couldn't have existed in the 1970's. Therefore someone did a lazy job in getting the correct map for the time period of the show.

(sorry for any inaccuracies!)