(at around 1h 0 mins) Mario stops by to see the boys, and gets out of his car in a pouring rain storm. The area behind him shows clear blue sky with bright sunshine. Seconds later, it's overcast; still later in the scene it's partly sunny; then overcast again.
After the crazy guy rolls the black Plymouth, you can see damage to the drivers side roof and the rear wheel on the driver side is bent at extreme angle. However, moments later when Thunderbolt and Lightfoot are going down the road neither signs of damage are apparent.
The right front wheel air deflector falls off the Trans Am when Lightfoot drives it out of the wheat field and onto the gravel road with Thunderbolt hanging on the passenger door. It reappears on the car in the next scene driving on Sun Canyon Road and then again at the stop at Diversion Lake.
As Thunderbolt and Lightfoot are being chased by Red and Eddie, Lightfoot careens the stolen Buick Riviera off the highway and down a steep embankment. Clint Eastwood's character (Thunderbolt, in the passenger seat) has obviously been replaced with a dummy. In addition, in some of the shots you can clearly see a large camera assembly, mounted behind the back seating area of the Riviera.
Red and Eddie's revolvers have "silencers". Revolvers cannot be silenced at the muzzle, because most of the noise of the shot occurs and escapes at the rear of the gun at the cartridge cylinder, which has open spaces at the front and rear to facilitate its movement in the frame as the gun is cocked and fired.
When Red and Lightfoot are opening the wooden crates with crowbars, the lid on Red's crate opens completely with one pry and the Lightfoot even lifts the top on his crate up before he uses the crowbar.