Visible crew/equipment: In the firefight scene, when Rocco and the brothers walk out of the house and see Il Duce, crew members are visible in the sunglasses. The most prominent example is in the head-on shot of the three men with Rocco in the middle. A man in a red jacket holding the camera is visible along with a half-dozen other crew members. Several of the shots between the timestamps have crew members' reflections visible in the glasses.
Other mistake: In the scene where the brothers are going to kill the "fag man", the fourth man has his shoulders perpendicular to the brothers in the center of the room but the bullet goes straight through his chest. The shot wasn't even at a close enough angle to go through his chest like that.
Continuity mistake: When they bring coffee to the brothers in the police station, one of the guys holds up the tray and there are three cups visible. The brothers take two and walk away. The next shot is from in front of the brothers, where you can see, over their shoulder, that there is no one holding up the coffee tray. The next shot is of the group again, and the tray is back to being held up.
Add timeNick Bylsma
Revealing mistake: In the scene where Rocco kills the two 'goodfellas' in the restaurant, he hides his gun by holding the gun behind his coat. Before the shot switches, you see the gun go off, yet the hammer is down the entire time. The revolver could have been single or double action, but the hammer would still have to have gone back. It is easier to see the gun go off on the NC-17 version or on the deleted scene, but you do see the flash on the R version.
Revealing mistake: Prior to the scene where the trio raids the card game, the three bring the wife, hands bound, to enter the security code. When the guy "cuts" the duct tape, look closely at the wife's hands, the knife never actually cuts the tape; rather he pretends to cut and simply lifts the tape... and voila, her hands are free.
Factual error: At the beginning, the MacManus brothers are attending a Catholic mass. The priest is saying the Our Father, and concludes it with "For thine is the kingdom, the power, and the glory for ever and ever." However, Catholics do not include this line when they say this prayer - only Protestants say this. Also, the prayer is never said before the priest gives his homily as it is in the movie.