The new Cadillac is seen to be covered with a tarpaulin. When the camera swings back to it, the tarpaulin has vanished.
Chicamaw's right eye is fine in a brief scene toward the end; otherwise, it is opaque.
When Bowie pulls around with the car after robbing the bank, Chicamaw jumps into the back of the car and T-Dub sits in the front. In the next shot, Chicamaw sits in front and T-Dub is in the back.
Early in the film, when the old man pulls into the garage and knocks over an oil drum, he puts a pretty good dent in the left front fender. When Bowie finishes changing the tire, the old man's daughter, who had jacked up the car earlier, lets the car back down off the jack, and the dent is practically gone.
The breeze on the bushes makes it obvious that a helicopter is shooting the opening scene.
(at around 1h 12 mins) When Bowie and Keechie are supposed to be alone in a motel room, a shadow of a crew member is visible moving across Bowie's back as he leans over Keechie, who is in bed.
(at around 49 mins) The reflection of the boom mic appears in the driver's side windshield.
Bowie pays for the mountain cottage twice--once at the property entrance, and again inside the cottage.
Near the end, when Bowie and Mattie are talking in Mattie's office, the calendar shows that it is August, but Bowie is wearing a heavy overcoat (he also wears it while trying to convince Hawkins to help them get to Mexico). Such an overcoat is not appropriate attire for the hot weather of Texas in August.