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To differentiate between Sydney and her sub-conscious, one of her is wearing white (herself) and one of her is wearing black (her sub-conscious).
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Number 47: The time shown on Sydney's brain monitor in Dr. Brezzel's flat is 13:47:15.
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Number 47: The fireworks in Sydney's dream - represents the 4th of July - 4-7 - 47.
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Number 47: During Sydney's flashbacks, the room she was wheeled into while unconscious was numbered 47.
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When Sydney is defibrillated the paddles are outside her clothes are on the wrong side of the body.
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Goof:
When Sydney is fighting against herself, she shoots herself six times, in two rows of 3, and each row of three bullets are completely parallel to each other, but when we get a new shot [excuse the pun], of the shot Sydney, the middle bullet hole in the lower row of bullets is below the other two, and not parallel like it was before.
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There's a rather large air bubble in the first injection that Brezzel gives Sydney.