Visible crew/equipment: Towards the end of the movie when Whitney Houston is in her hotel room with Kevin Costner you can see the mic in a reflection in the window of the suite.

Continuity: In the scene in Frank's basement the ends of Rachel's scarf change: Before she picks up the sword the right end is longer, afterwards the left end. In between there's a close-up where she is holding the sword in front of her and where both ends are at level.

Other: It's not really a mistake but when Rachel is our running and she asks Frank to walk with her, if you look in the background, there are 2 "ghosts" walking hand in hand behind them.