When Ann McKnight is throwing the dice at the roulette table, her purse changes orientation from cut to cut. It starts with her holding it under her arms then it is resting on the roulette table and then it is under her arms again.
When Reagen looks up Ann's address in the phone-book it reads 650 and a half Pkview. However, when he arrives at her building, the number is 560 and a half.
During the opening credits, some of the same background actors are walking back and forth past the camera through the various sequences.
When the cop tells the squad car driver to follow the cab that Tony just left in, a few people in the front near a double-parked car are looking at the camera and following the action.
When Tony leaves the Palmer house and walks down the street, some pedestrians look at the camera and check out the filming. An African-American woman spits on the ground and then covers her mouth with a handkerchief. They used real people as opposed to professional background actors.
When Ann is throwing dice at the tables her purse falls off the table however she ignores it as if nothing happened and continues rolling the dice.