When woman is killed in her apartment, locket is under her, but in the next shot, it's clearly visible and not under her.
Early in the graveyard scene, as they are walking, the position of the actors changes between shots. In the side angle, Karl Malden has his left arm raised with his hand on James Franciscus' right shoulder, in the angle showing them from the front, Malden has his arm down and Franciscus is gripping his shoulder.
When Anna is escaping from the police, at the end of the chase, we first see her get away, and then policemen come and are confused, because they lost them. Car's parked are different between two shots and so is the traffic. In the first shot the street is empty, while in the second there's traffic.
Man offers a hand for a handshake to another man. Position of the hand is changed in the next shot.
Two men fight, one throws a stool at the other and he for some reason ends up on the different side of the room. Stool disappears.
At the train station, Calabresi is pushed in front of the train at the last moment, with no advance warning. As such, it would be impossible for the photographer to snap the victim in the split second of free fall, as happens in the script.
It appears the barber shaves the right side of Giordano's face twice. However, part of the scene is shot in a large mirror, so it only *appears* the barber shaves the right side of his face twice.
When Carlo and Anna meet at the rooftop cafe for a drink, it appears to be late
afternoon. A few moments later, a waiter replaces an ashtray and, when the
camera goes back to the couple, it is almost totally night time.
When Carlo is watching a parking area from a window, he is describing what he sees to Franco. He says "Here's Terzi and his daughter Anna." But when he says "and his daughter Anna," just her leg has come into view (while the rest of her is behind a concrete wall. So, he actually identifies her before he can even see her, making him either clairvoyant or able to see through walls.
During the fight scene at Braun's, James Franciscus, undubbed, can be heard saying, under his breath, an obscene equivalent of the phrase "Gonna "mess" you up!"