I just saw this movie again on tv and I have to say that the Rachel McAdams' body double in some physical scenes is really bad!
Rachel McAdams has a light brown hair and she's a pretty small woman and the body double has dark brown hair and she's taller than Rachel
Just read on this site maybe in Trivia that Murphy threw McAdams so hard in the scene in the bathroom, she hit her head & was unconscious for 1/2 hour. She said she'd do the scene again but he was terrified of hurting her again. Maybe after that they got a body double. But the scene in the bathroom is her and when Murphy finally did the scene it said if you look closely, he is holding her head to protect the back of it. Thought you'd be interested.
PS hair color is mainly a result of the lighting of the space where filming is done. Natural sunlight makes hair look lighter, etc.
when she runs on the moving sidewalk and falls at the end it is really noticeable. Besides, why do you need a double for that? You can't just fall down?
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I did sixty in five minutes once...