Directed by: David Dobkin
Starring: Elizabeth Banks, Paul Giamatti, Vince Vaughn, Miranda Richardson, John Michael Higgins
Revealing mistake: In the beginning when Nick gets a present from Fred you see that the background is fake.
Revealing mistake: When Fred and Nick are fighting on the snowmobile in the background in one shot you can tell that it is painted and it's fake.
Continuity mistake: After the security elves kidnap Fred and take him to the family invervention, Fred pulls most of the wrapping paper off himself, leaving a small patch of paper stuck to his shirt on his left-hand side. This patch disappears and reappears between shots throughout the rest of the scene.
Clyde: You're all fired, in the morning you'll all be on a bus back to Elfistan.
Trivia: Siblings Anonymous features three real brothers of celebrities: Frank Stallone, Roger Clinton, and Stephen Baldwin.