Continuity: The odds on the chalkboard when cyclist #2 falls off his bike.
Continuity: When Madame Souza, pretending to be blind, is following the mechanic, she approaches a junction where there is a fire hydrant, a newspaper vending machine and a pedestrian crossing. In the next shot, all have vanished.
Continuity: Near the End, where the Triplets and Souza are going across the bay over the bridge, you see a ship passing under it into the harbour. However, when the Mafia goes over the edge into the funnel of the ship, It is leaving the harbour, not entering it.
Continuity: In the betting scene we see the bet master with 3 cards in his right hand (they go in the order: 2-1-3). After cyclist #2 is shot we see the bet master again with the same 3 cards in the same order.
Continuity: When the two waiters are running to the Mafia in the restaurant, the left-hand waiter's hair color is black, but in the next take his hair is gray.