I really can't think of any more. If you have an idea of one you should make a comment. This is someone who blows their cover who is supposed to keep it a secret.
http://www.ranker.com/list/the-best-identity-giveaways-in-film-history/stokified,
Lucky Number Slevin
Slevin reveals he was the kid whose parents were killed by the 2 feuding crime bosses. The movie is basically his revenge.
Daniel Craig (Casino Royale)
James Bond reveals he is James Bond at a poker game. Usually telling someone you are the most notorious spy in the world isn't a good thing.
Michael Fassbender (Inglorious Basterds)
Archie Hicox reveals to a Nazi Major that he is not German with a hand gesture.
Brad Pitt (Fight Club)
Tyler Durden reveals he isn't real.
Skeet Ulrich and Mathew Lillard (Scream)
These guys both reveal they are ghostface in Scream.
Leonardo Dicaprio (Shutter Island)
Teddy Daniels identity was blown to himself
Tobin Bell (Saw)
The mastermind jigsaw killer was acting like a dead body then gets up at the end of the movie. This GIF is Adam's reaction to a dead body standing up and locking him in the torture room.
Leonardo Dicaprio (The Departed)
Billy gives up his identity on the cell phone to someone he doesn't know (Matt Damon.)
Bryce Dallas Howard (The Village)
Ivy reveals the identity of all the elders in the village, and she doesn't realize it because she's blind. It's when she leaves the village to get medical supplies I couldn't find a GIF on it.
Tim Roth (Reservoir Dogs)
Mr. Orange reveals he's a cop then the screen goes black and we hear a gun shot.