#KitHarington’s first day filming #GameOfThrones was also his first time ever acting on camera. “I thought I had to be as still as I possibly can be.” “In your defense,” adds #PeterDinklage, “Jon Snow can be sort of a frozen character. Tyrion is a bit more fun than Mr. Killjoy. Or Mr. Do the Right Thing.” Stream the full #ActorsOnActors episode now on the @CNN app.

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