Character mistake: When Donovan's bodyguards surround Helena and Weatherby, the katanas are drawn incorrectly. They draw the katana edge downright. They are supposed to be drawn edge upright due to easier striking motions, whereas when drawn edge down (with the exception of the katana predecessor the tachi or unless in armour), it damages the saya (scabbard) and can dull the edge.
DOA: Dead or Alive (2006)
1 character mistake
Directed by: Corey Yuen
Starring: Jaime Pressly, Devon Aoki, Sarah Carter, Holly Valance
Continuity mistake: When Helena is being scanned by the computer, you get to see multiple simultaneous angles of her on the computer screen. Her head movements in one of the images do not match what her head's doing in the others. (00:18:15)
Christie Allen: Look at this. They've been monitoring everything we do.
Tina Armstrong: Jeez, bunch of pervs.
Trivia: A Wilhelm scream can be heard during the beach volleyball/fighting scene - a henchman is thrown off a balcony and emits one as he falls.