I've heard this "slip-up" a milion times and I just thought I would say something about it this time. There are a couple more mistakes like this in the movie, but it's not really a mistake. After they make a movie, they go back, and check for mistakes with the sound, and sometimes they go back and change lines, I think by recording the person's voice saying the other thing, and then putting it in there somehow, and that's why you see them mouth something different then what you hear. I think this might be a little hard to understand, but I did my best on explaining it. I think it's called sound editing.
I understand, that they go back and edit things, and lines are changed. But all Jordan is saying was that they missed it. It was a slip-up. You hear Dewey! and see No!
i agree that this is a slip up but i thought i would add that wes craven wanted to see whether dewey was going to be a popular character or not.so he made sydney say "no!" as if he was dead but because the audience liked Dewey he changed it to "Dewey!" because that way it 'sounds' like Dewey was gonna live for the sequel.
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