The Black Dahlia (2006)
District Attorney Ellis Lowe appears in both movies, it is not a coincident as the movies are both based on books from the same series.
The older film is mentioned in dialog.
Shown playing at local cinema
Mentioned by actress in screen-test film.
Keystone Kops mentioned/this is their first movie
listed on computer site
Poster in hallway of Adam's office
Poster can be seen when Bruges leaves the backroom of the video store after the discussion with the head of the swat team
characters watch this film