Urban Legend

The headmaster's license plate is 23019B.

Wayne's World 2

Check out the calendar ("I once knew a girl Gordon Street" scene).

The Time Traveler's Wife

Their winning lotto numbers include a 23.

Sunshine

"23 hours ago, while checking the comm systems..."

The Devil Inside

Isabella found the truth about her mother on May 23rd, 2009. Also, I believe Ben says he witnessed his first exorcism at 23.

My Week With Marilyn

Colin Clark is 23 in this movie. They even say it in the trailer.

Page 23

An upcoming movie. Thanks Brian for the heads up!