When Lewis and Fuller hear Rusty Nail on the radio asking for Black Sheep and Mama's Boy and realize he knows they are behind the prank, Fuller calls Rusty Nail "Russell" on the CB. Nowhere in the movie/additional scenes/commentary is the name "Russell" mentioned as a name for Rusty Nail. Anyway, how would they know Rusty Nail's real name, if that's what "Russell" was supposed to be?
As Lewis, Venna, and Fuller are driving out to the corn field, Fuller is wearing a blue shirt with a brown jacket. While running through the corn field away from Rusty Nail, however, Fuller is wearing a cop's hat and cop's jacket, obviously from the original ending.
Fuller, Lewis, and Venna are to meet Rusty Nail at the State Line Truck stop, and an establishing shot of the truck stop is shown. However, it's the same exact truck stop Fuller and Lewis stopped at when they first started out on the road trip. They would never see that truck stop again if they are on a one way trip as it is depicted in the movie.
When they first get the CB radio, the antenna switches from the left to the right side of the Newport and back again (the film is flipped). When the antenna is seen on the right side, the rear bumper of the car appears smooth with the prominent dents missing.
Because of re-shoots, the dates are inconsistent. The insert of Lewis's plane ticket shows he purchased it 12 DEC 99 for a 12 APR (2000) flight, yet when Fuller signs for the release of his effects, he has dated the form "6-6-99".
When Lewis and Fuller first make contact with Rusty Nail on the CB, as the camera cuts back and forth between Lewis and Fuller in the car, the door lock on Lewis's side of the car is alternately up and down.
When Lewis calls the sheriff's department at the gas station with the ice truck driver he asks for the Rawlins County Sheriff in Table Rock. Table Rock is in Sweetwater County and Rawlins is in Carbon County. There is no Rawlins County in Wyoming.
When Fuller first starts using the CB, a shot of the face plate of the CB shows that the radio is on ch 19 and the band selector is set to USB (upper side band). It should be set to AM for the ch 19 that truckers use.
When Venna emerges from the gas station with a hat for Lewis, she is wearing a new blue T-shirt that is long and bunches at the bottom. Later when they are in the bar, it shows Venna wearing the same T-shirt but noticeably shorter. In the commentary of the movie, Leelee Sobieski explains that she changed into a smaller shirt for the later scene.
When Fuller and Venna are outside the motel room, Fuller takes her key and uses it to open the lock. When he turns the key, the whole knob turns, indicating that the knob was never locked. (See Goodfellas for the same mistake.)
When the ice truck pulls into the convenience store, the rear axle is about 3 feet from the end of the truck, as is usually the case for any kind of box truck. When Rusty Nail drives his truck through it, the axle is pushed to the very end of the trucks frame, presumably to allow Rusty Nails truck to drive through it.