Multiplicity

The Parent Trap, while different in its kid-friendly tone, revolves around the charming antics of identical twins (played by a single actress, Lindsay Lohan) trying to reunite their separated parents. The doppelganger shenanigans offer a lighter take on mistaken identities and could appeal to fans of duplication comedy like Multiplicity.

Being John Malkovich dives into the surreal as characters gain the ability to enter the mind of the titular actor, leading to a unique multiple identity situation. The film's offbeat and existential humor draws parallels to the identity crisis themes presented in Multiplicity.

Austin Powers: The Spy Who Shagged Me brings back Mike Myers in multiple roles, showcasing a comedic range similar to Multiplicity. With time travel antics and a host of memorable characters, it's a groovy choice for fans looking for more than one dose of a beloved actor.

The Nutty Professor features Eddie Murphy in a tour-de-force performance, playing multiple characters through the use of transformative makeup and effects – much like Michael Keaton's portrayal of his character's clones in Multiplicity. Fans of the high-energy comedy and the theme of one actor in multiple roles will find plenty to enjoy here.

Jim Carrey's split personality antics in Me, Myself & Irene channel a similar vibe to Keaton's performance in Multiplicity. With the Farrelly brothers' signature comedic style, this movie tackles the concept of one body with multiple personalities, albeit in a more exaggerated, slapstick form.

Dave takes the idea of doubling and identity into the political realm, with Kevin Kline playing both a regular guy and the President of the United States. This light-hearted and charming flick echoes Multiplicity's theme of an ordinary man finding himself in extraordinary circumstances.

Bowfinger, starring Steve Martin and Eddie Murphy, delves into the world of movie-making with a side of dual identity comedy. Murphy's portrayal of two vastly different characters—a movie star and his nerdy brother—will amuse those who enjoyed Keaton's clone-filled performance in Multiplicity.