Salem's Lot (1979)

Cully's gun serial number.

Wet Hot American Summer

Just a timestamp. Still awesome.

The Girl With the Dragon Tattoo (2011, US)

Lisbeth is 23 years old.

Thanks Josh for the submission!

Rampart

Woody Harrelson's police car is # 232

The Dark Knight Rises (or whatever)

""Gotham has 23 days until the bomb goes off""

I wish it would, shitty stupid movie.

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!

Pearl Jam 20

Eddie wears a 23 on his shirt when they are writing "Daughter", about 45 mins. in.

Thanks, JB!!

The Muppets

Almost 100% positive 80's Robot's licence plate started with 23. If anyone can confirm I will love you forever.

Christine

SPOILERS:

"Towards the end, after the car kills the fat kid in the alley, the next scene starts with the caption 'November 23'".

Thank you Jon at Asylum Studios for this submission!

Freddy's Dead: The Final Nightmare

Doc (Yaphet Kotto): "I only get 23 minutes a week with these kids."

Rabbit Hole

Dianne Weist's character's house number is 6923.

Pic to follow

Stranger Than Fiction

From IMDB: Dustin Hoffman's character (Professor Hilbert) creates a questionnaire of 23 items forWill Ferrell's character (Harold Crick). Professor David Hilbert, the German mathematician, proposed a famous list 23 problems at the International Congress of Mathematicians in Paris in 1900. Hilbert's problems became so famous that they are typically referred to by number among mathematicians and philosophers and several are still unanswered.

Diary of the Dead

Doesnt really count, but it was filmed over 23 days. This movie is so shitty, I don't even want to bother to look for a 23. If anyone knows of one, let me know.

Hellraiser 4

There is a 23 (?) minute timer on the spaceship.

Thanks Brian at Horror Movie A Day!