Other mistake: On the back cover of Scream 3 in the Scream trilogy on DVD, the town of the original killings is referred to as Greensboro twice. The correct name of the town is Woodsboro, of course.

Scream 3 (2000)
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Directed by: Wes Craven
Starring: Beth Toussaint, Courteney Cox, David Arquette, Emily Mortimer, Jenny McCarthy, Kelly Rutherford, Lance Henriksen, Liev Schreiber, Neve Campbell, Patrick Dempsey, Roger Jackson
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Sidney: Hey Detective, what's your favorite scary movie?
Mark: My life.
Sidney: Mine too.
Question: Is Detective Kincaid the second killer? Two pieces of evidence spring to mind that he could be. One, he borrows Dewey's phone and soon afterwards Sydney is rung up by the killer and two, Roman Bridger has a bulletproof vest.
Answer: No, remember, the detective says something along the lines of "In the third movie, all bets are off." Meaning that you can't expect the same formula (ie two killers) as the first two movies.
Answer: The line, "In the third movie, all bets are off," means to expect the unexpected. That anything goes, the hero could die, the killer gets away it or the boyfriend dies. There is an ending but not a predicable one.
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Answer: Those are misdirects/red-herrings to make you suspect Kincaid. Not actual pieces of evidence. But Roman is confirmed to be the only killer in the film. Originally, there was going to be a second killer (as there is in the three other films), but the idea was dropped during production to change-up the formula slightly and keep audiences guessing.
So how could Roman call her in that moment?