hi! not discouraging anyone from contributing more info, but FYI you'll find several previous discussions in the FAQ*
*see the link on the sidebar or the wiki tab
You may be interested in some of these:
http://www.reddit.com/r/AskHistorians/comments/1cotb4/what_are_some_of_the_major_inaccurancies_of_the/ http://www.reddit.com/r/AskHistorians/comments/1lfonq/how_accurate_th_viking_tv_series_is/
The FAQ is your friend.