Northam's accent (mild spoilers)
I thought Northam did a very good job with an American accent, better than most Brits, although it took a bit of getting used to seeing that face with it.
SPOILERS FOLLOW -- But did everyone notice that in the last scene, when he was back to who he really was, he was using his normal British accent? Even the American accent was part of the person he had brainwashed himself into. I thought that was a very good touch to the overall story.
TxMike
Well-timed silence hath more eloquence than speech.