Revealing mistake: At the hockey game in the beginning of the movie, when the players crash into the boards behind the goal, the logos on the players uniforms are backwards or opposite of what they really should be. The Devils logo appears this way several other times in the movie as well.
Little Black Book (2004)
1 revealing mistake - chronological order
Directed by: Nick Hurran
Starring: Kathy Bates, Brittany Murphy, Holly Hunter, Ron Livingston
Continuity mistake: At the end, when Stacy faints from seeing her favorite singer, when she is on the ground she drops her phone right next to her ear, but when the singer goes to pick her up the phone is near her arm.