After Caesar is killed, he blinks with his eyes closed.
Though the film is set in 1985, the trailer depicts an NYC street sign colored white on green. Until 1990, each borough's street signs had different color schemes. Manhattan was black on yellow, for instance, while Brooklyn was white on black.
When the trunk lid of the Trans-Am opens to get Gino out, the sound of gas struts extending can be heard. 2nd gen Firebirds don't have gas struts.
Wheh Carmine is walking down the sidewalk to the store, a lady comes out of the front door. When Carmine starts to close the door you can see the cameraman's reflection off of the glass.
Early in the movie, the kids are walking on the beach and find a body. That beach is in Staten Island, not Brooklyn. The Belt Parkway runs along the shore of Brooklyn near the Verrazzano Bridge, which is visible in the background.