british film where all the characters play more than one role

After a failed plastic surgery, an actress hires a double to replace her on the set - Unaware that it's her twin sister, whom she didn't even know existed.

A struggling actor blurs the line between reality and his performance.

An American actor poses as a British actor to get more more work as an American actor in America.

In this Broadway Brevities short, a stunt double is hit on the head and imagines himself in a series of movie scenes with doubles for various stars.