Season three of Game Of Thrones begins this week, premiering on HBO in America on Sunday night before airing in Britain on Sky Atlantic the day after. Based on George R.R. Martins novel series, A Song Of Ice And Fire, the show has soared to huge levels of global popularity since beginning in 2011 and the upcoming season, based on the first half of A Storm Of Swords (widely considered to be the best book in the series) will likely see its stock rise further as new characters are introduced and new storylines develop. Like most literary adaptations, the series has, to date, featured a number of deviations from its source material, particularly in the second season. Most of these changes have been minor, merely clarifying things that were ambiguous in the books (such as Renly and Loras relationship), fleshing out several characters who werent featured as point-of-view characters (which includes the majority of the supporting cast) to give them more screentime and make their motivations clearer, or merging minor characters together to limit confusion for casual viewers. Some of the alterations, however, have been huge, changing entire storylines. Whilst some have made sense, the inclusion of some has been baffling, adversely affecting the development of several characters. The following list outlines four such occurrences from the television series, both good and bad, that are nowhere to be found in the books. Obviously, spoilers for the first and second seasons of the show will follow.