Near the end when Ace gets into his Cadillac, in the first shot facing the front of the car, there is a protective glass in front of Ace (the same width as the windshield) with the dashboard in between that glass and the windshield.
Note the vertical edge of the glass is visible at the right side, and the rearview mirror's sticker on the windshield casts a shadow onto the second glass.
During the stunt, the flames on the dashboard are between the glass shield and the windshield, keeping the actor safe from harm.
Sharon Stone repeatedly smashes her car into De Niro's in the driveway, yet if you look closely in the shots as she gets out of the car, there is no damage to the front of her car, not even a broken headlight or glass on the driveway.
When Remo Gaggi is talking to Andy Stone about Ace cussing out the Board, there's a pack of cigarettes beside Gaggi in his car.
The camera angle changes to show Stone's face, who is outside the car, and when it flips back to Gaggi, there is a Zippo lighter in place of the cigarettes.
The camera goes back to Stone, and when it comes back again, the Zippo is gone and the cigarettes are back.
And to top it all off, not once did Remo smoke in this scene.
When Artie Viscano is complaining to his brother in law about Las Vegas, he backs into about 10 bottles.
They all fall except for two, and then the scene cuts to to his brother in law and when the scene cuts back to Viscano, all the bottles are back up.
After meeting with Ginger about Lester being beaten up, Nicky is about to leave.
Before he does, Ginger hugs him and puts her arms around his neck.