It kind of irritates me that people find Sebastian Stan sexy and the 'hot stuff', etc. But when I said "Hey! People! Look how hot the mad hatter is nobody gave a damn... What about now bitches LMAO - visit to grab an unforgettable cool 3D Super Hero T-Shirt!
No ok so I've always that that it's because the TARDIS translates things so the companions can understand it, so it just takes into account the companion's accent. But Jack is already speaking in the same language, so they don't even worry about it and just let him speak American. Thank you very much. Goodbye.