Plot hole: At the bar shootout where everyone except Marlboro and Harley are murdered, the two jump through the window, over the fence, into the airport, and into an airplane luggage compartment. They would have been caught by security. The missing, and dead, airport worker would have been missed and searched for, the gunfire would have attracted attention, and the police would have been called. They never would have left the airport.
Plot hole: Norman, the orphaned new-born calf, could not have survived more than a few days after birth unless he was adopted by a foster-mother cow. The cattle were not dairy cows, and it's obvious the "cowboys" are not providing milk or other sustenance for Norman. Even if he had lived, he would be extremely weak and emaciated and physically unable to run with the herd.
Suggested correction: We see that they are providing said food for Norman, and secondly, we never see if another cow does indeed do exactly that. After all, they can give milk, just not enough to sell, so Norman could indeed get fed.