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 Reduce TV-series info in lede? 

Now that the TV series is in progress, I think this is too detailed: ""In November 2009 HBO completed filming of a pilot episode for the television adaptation.[3] This was followed by a ten-episode full season, which premiered in April 2011.[4][5]"". I'd suggest just adding a mention to the previous sentence, as follows:
The novel lends its name to several spin-off items based on the novels, including a trading card game, board game, roleplaying game, and television adaptation.
Any objections?   "