The position of Cybil's hand on Michael in the motel room.
When Murphy goes into the bathroom at the hotel after the robbery, the shaving brush moves between shots and the razor disappears altogether.
The length of Murphy's cigarette alters while he opens the bag with money that Cybil has brought him. When he starts speaking to her there's no cigarette in his mouth at all.
When the police show up at Cybils house after she called 911 her front door opens to the right. When Murphy goes to the house after they leave the door opens to the left.
During the "slug bug" scene, Murphy hits Jesse on the left side of his head, but in the next shot, Jesse is holding the right said of his head.
The Casinos on Fremont Street have all of their outside lights turned off while the Freemont Street Experience is running. In the movie they are both lit at the same time.
The Wombats supporter in the van compares wombats to groundhogs. A wombat is a quadruped marsupial which is at least ten times the weight of a groundhog, over double the size in the body, and capable of running at nearly four times the speed of a groundhog. They are very different animals.
As the robbers are escaping from the casino floor in the elevator, a plain clothes cop sticks his gun and forearm through the closing elevator doors and the doors stay closed against his arm. When closing elevator doors meet an obstruction, they open back up. (It is shown on screen that Michael had sabotaged the elevator so that the doors would only open or close at his command. Hence why they didn't open back up when the cop's arm got trapped.)
In actuality, it is approximately 1,500 miles between Las Vegas, Nevada and Graceland in Memphis, Tennessee.
When the Cadillac Coupe DeVille is driving into the river the trace of the pulling cable is visible on the water surface.
Reflected in Murphy's sunglasses as he is riding in the stolen van.
While in the Boise Courthouse, they say "Boise County Court is now in session." The city of Boise is not in Boise County but in Ada County.
The quintet of robbers enters the Riviera Casino from Fremont St. The Riviera is about a mile from Fremont St.
During the casino robbery, the off-duty police officer who gets his hand caught in the elevator identifies himself as "Vegas PD." The law enforcement in Las Vegas has been called the Las Vegas Metropolitan Police Department since the 70s, and a real officer would have identified himself as "Metro Police."
When Quigley and Damitry are discussing Murphy's file, Quigley says Murphy along with 75 others were denounced in their case of being Elvis Presley's biological children. In his very next line Quigley says DNA testing eliminated 73 of the 75 outright. Damitry then asks him if Murphy was one of the inconclusive 2 remaining defendants, to which Quigley responds by showing a picture of Murphy's sideburns. This exchange implies that there were only 75 defendants total when the earlier statement points to 76.