When the driver is shot in the right ear (blood everywhere) at about 17:20, the car goes out of control. When the car veers around the tree and goes skidding on two tires (about 17:38), we see the driver's right ear (17:39) - it is now uninjured.
Parker steals a blued M1911-type pistol from the hunters' motel room and it ends up in his duffel bag. Later, the blued M1911 has been replaced by a nickel-plated M1911, Ross's "best .45" from later in the film.
During the opening credits sequence at the Ohio State Fair, Parker buys his ticket to enter the fair at the Ohio gate (11th Ave.)but at the very next scene he's emerging from Cardinal gate, which is located at the opposite end of the fairgrounds.
Parker is rescued by the tomato farmer's family and placed in the back of the truck. At one point Parker, lying down, looks up at the man to his right, and the son to his left, who's wearing a dark shirt. The camera then takes us briefly to Parker as we watch him trying to listen. The camera quickly returns back to the man and son who are in the same positions, but now the son is suddenly shirtless.
When Parker slides under the garage door as it is closing (twice) at Melander's house, he would have broken the infra red safety beam, so the door should have stopped and re-opened, alerting Mr. Rodrigo and his gang.
After Parker steals clothing and items from the hotel room belonging to the hunters it is raining. The rain is obviously not real since it moves to cover up the entire frame as Parker is walking. Also the rain falls in an arc suggesting that it is not falling naturally.
When the SUV goes out of control following the carnival job and goes up on two wheels, one of the shots clearly shows the SUV's lights indicating it is in reverse gear, even though the car is always accelerating and moving forward throughout the scene.
As Lesley and Parker drive in the Bentley for the first time the upper side of Lesley's door is in dark blue/black leather, the next shot the leather is beige, the following shot its in dark blue black again. this change in color (different cars obviously) is seen in various scenes throughout the movie for example when Parker was pretending to read a newspaper when he was actually watching the main villain, and when he is driving with Lesley in another following shot it is in beige, however when he tells her to get out of the car the upholstery is in blue.