The hardest part was to scrub poor Amy out of the picture. Because of her pose, Sherlock didn't block her from view completely and rebuilding a scene is a bitch! Haha!
Benedict Cumberbatch would make a FANTASTIC Doctor. And the guy who played Moriarty (his real name escapes me at the moment) would be a brilliant Master. That's all I could ever think about when watching Sherlock! Moriarty even did the tapping thing every once in a while like the Master would!