Continuity mistake: When De Niro is proposing to Sharon Stone, the position of his head is not continuous between the front and back shots.
Continuity mistake: When Ace is having a meeting with Green about him firing the cowboy, Ace stubs out his cigarette. In the next shot from behind Ace is still smoking, but when in the front he has no cigarette.
Continuity mistake: It is daylight when the car of Ace Rothstein explodes. However, it is night when he is being placed in the ambulance.
Continuity mistake: When Nicky goes to Sam's house to meet with Charlie, it's very light outside when he arrives. However when he leaves about four minutes later, the sun is setting. His entire stay at the house takes place during that scene.
Continuity mistake: Stone is caught on the phone planning to kill DeNiro, who grabs her violently and pulls her black satin robe off. A frame later she has it back on.
Continuity mistake: The man who is receiving a giant check for the Tangiers raises his right hand towards his waist, but in the immediate next angle, the hand is down and he is raising it again.
Continuity mistake: When Nicky Santoro meets the men in the desert, first he is getting out of the car with one person, but then he is in the next shot getting out of the second car which just pulled up, and he is getting out of the car with Frank Marino.
Continuity mistake: About an hour and a half through the movie there is a scene with Nikki on a black and white TV. On the TV they are showing a photo taken by police of Nikki talking to another man holding a toothpick to his mouth to cover his lip from lip readers. That scene takes place later in the movie. The police have not yet taken that photo, we see it happen later on. (01:32:49)
Continuity mistake: When Sam is talking with Philip Greene after firing Ward, there is a shot of Sam facing the camera gesturing with his right hand not holding a cigarette, the a shot with his rear to the camera holding one, back to a shot facing the camera with empty hands again. (01:10:45)
Continuity mistake: When Sam tells Nicky he's been banned in Las Vegas Sam holds a cigarette. His hand's position has no continuity between any shot.
Continuity mistake: When De Niro is by the pool, the way he holds his cigarette changes from vertical to horizontal depending on the angle.
Continuity mistake: In the scene where Joe Pesci tells Robert De Niro that he's moving to Vegas, both of their windows are cracked. De Niro's stays opened the same length until just before the scene ends, when it is opened nearly twice as much as before.
Continuity mistake: The guy's whose head is put in a vice has a trail of blood running along the left side of his mouth which appears/disappears randomly between shots.
Continuity mistake: After the very tense encounter between Ace and Nicky in the middle of the desert with De Niro watching Pesci leaving quickly, the distance between Ace and his car changes enormously in two different shots.
Answer: Frank Rosenthal (the basis for Sam Rothstein) and Tony Spilotro (the basis for Nicky Santoro) were both from Chicago, so that is likely "back home".