When Sgt. Frances Lazerov is chasing one of the bank robbers in the beginning of the movie, he says "Come out, come out, wherever You are". Which is a line taken from the movie The Third Man - originally spoken by Harry Lime (Orson Welles).
Originally set for a US theatrical release in 2005, the film was pushed back after poor test screenings. Ultimately the film was release direct-to-DVD in the domestic market after remaining unreleased during a sustained time of uncertainty.
At 1:11:13 a gunshot is fired which sounds silenced, at 1:11:15 the gun which fires the shot is shown with no silencer and the slide of the gun is shown locked open as if its the last shot in the magazine, then at 1:11:17 the same gun is shown again with the slide closed back in its normal position without any noise or character interaction.
In the first scene at Ashford's apartment Pollack exits into a hallway, onto an elevator (and goes down) while Ashford dances. In the second scene at the apartment Pollack is pushed out of the door onto a rainy sidewalk.
When Lazerov kills the drug dealer in the opening scene, he doesn't even use the revolver they plant as the murder weapon to kill him, he uses his police issued 9mm. an unfired gun with a different type bullet would obviously reveal foul play.