As Eddie watches Mrs. Atwood and her henchman with the injured cheek climb into the limousine he is wearing a white shirt, he walks off in a striped shirt then arrives and leaves the identity parade in a light blue shirt.
In the cafeteria scene, when Eddie wants to loan $100,000, he also reveals that he quintupled his money four days in a row. Some scenes before, he started his investment with $800, quintupled for days it will be $500,000, so what is the need for borrowing the money?
During the fight in the fancy condo at the end, Gennady shakes his case of pills, saying he doesn't like getting this low (implying he still has some left). There is an audible rattle of pill inside. He then explains he transforms the pills to an inject-able form. Shortly after, when the fight is over, and Eddie needs a dose, he drinks the spilled blood.. ignoring the case with Gennady's remaining pill inside.
When Gennady and his hit-men try to break into Eddie's apartment, the metal door has no marks on it. In the next scene where they cut out the lock, a gunshot is visible to the right hand side. Once inside, the door has no marks. After killing Gennady and pushing the needle into one of the hit-man's eye, the other starts firing at Eddie causing the bullet hole in the door from the earlier scene.
At the end of the movie when Eddie is talking with Van Loon, it is clearly daytime. However, the shot immediately following Eddie closing Van Loon's car door where Eddie begins walking away to his "lunch, it is obviously nighttime in the background. All the street lights are on and there is a dark sky in the background.