1) While waiting in one of Bart’s labs with Watson prior to the roof scene, Sherlock is shown with his feet planted well and truly on the desk. An unusual pose for him, but it does put on view for a brief moment one aspect of his clothing. His shoes. Also when he stands you can clearly see that they are secured with quite visible laces. When he appears on the roof with to meet Moriarty his shoes are different. Laces not to be seen and the heel appear to be deeper. Why would he change shoes?
2) He confronts Moriarty and while in doing so they both appear to look on the edge of the roof down to the street below. The next shot in the film shows a street scene from above (the area where ‘Sherlock’ hits the pavement) but this does not necessary mean it is the view that Sherlock and Moriarty are seeing.
3) After a discussion with Moriarty, Sherlock stands right of the edge of the roof where he is standing facing outwards with Moriarty still talking to him with head level at Sherlock’s elbow. The next shot is from street level looking up at the corner of Bart’s and we see a lone figure, dressed as Sherlock, on the edge of the roof. No sign of Moriarty anywhere near him or to be seen.