When Michael gets into the back seat of the car to discuss the fine German lenses that he has procured, it is obviously dusk. But in the next shot from the car's interior, it's night time.
A pedestrian passes the mailbox just before Johnny Boy blows it up. After he blows it up, though, the man is nowhere to be seen, although he was close enough to be injured by the blast.
During one of the pool scenes, balls disappear and change position between cuts.
As Teresa is getting out of bed when she is with Charlie, in one shot the blanket covering her is pulled off nearly completely, yet in the next shot it covers her again, before being pulled off once again.
Tony is driving with a bandaged right little finger, then the bandage is gone and it reappears again.
The end credits on the DVD incorrectly list David Carradine as "Oscar" and Robert Carradine as "Drunk".
When Charlie is in the back seat of Michael's car (after the bar shooting scene), his audio is slightly off.
You can see De Niro's mic pack on his back when he gets up to walk to the window at Charlie's house after staying the night.
Camera shadows are visible during the bar fight.
As an inflicted Charlie gets loaded into an ambulance at the end of the film, the camera's shadow is visible on his legs at the bottom of the screen.