Looking through the viewfinder, pictures taken by the FBI show Pauly walking on the water side to the left of the doctor. Later, when the photos are shown, their positions are reversed.

When Vitti is getting ready for the big meeting he sees in his mirror a television ad that reminds him of his father. Before he sees it the TV faces the audience, then must turn to be seen in the mirror. After Vitti sees it, he sits on his bed to watch the commercial, so the TV must again turn back around toward the audience.

At the start of the movie when the two mobsters throw the farmer off and hi-jack his tractor, the farmer disappears when the tractor starts to turn to run and then run over the corn.

At the final meeting, when Ben hugs the fat gangster, he's wearing a shirt with cufflinks. Later at the meeting, he is wearing a button cuffed shirt.

Vitti's two children disappear immediately after he introduces them.

FBI agents are shown participating in the 1957 Appalachian raid. In that year, J. Edgar Hoover's FBI's official policy was that the Mafia did not exist, so no federal agents were involved in the raid which was conducted by New York state troopers only.

Ossining Prison (Sing Sing) is a NY State prison, not a Federal prison.

Prior to the guy falling from the hotel window, there is a lot of gunplay with the guy chasing Jelly and Jimmy down a short hallway in Vitti's suite. As they pass the hall closet, there is a wire visible that pulls the closet open.

In the tractor hijacking scene, the tractor is a John Deere 730 that came out in 1958 while the scene is supposed to take place in 1957.

Jelly and then the Doctor say 'consiglieri' meaning the doctor's would-be position in Vitti's family. However, the correct form would be 'consigliere' that is an advisor in Italian. The word 'consiglieri' is the plural from 'consigliere'.