Due Date is a 2010 comedy film staring Robert Downey, Jr. as Peter Highman and Zach Galifianakis as Ethan Tremblay/Chase. Together they go across country to get to California in time for Peter's baby to be born.
Connection with Two and a Half Men
Ethan is an aspiring actor, who decided to become an actor after watching Two and a Half Men (especially Season 2). He even created an unofficial fansite, itsrainingtwoandahalfmen.com. In the end of the film, Ethan lands a role on Two and a Half Men as Rex, and even features Jon Cryer as Alan and Charlie Sheen as Charlie (Angus T. Jones filmed a part that was cut). The episode in the film is not a part of any actual episode, and is therefor non-canon.