Near the end, when Marshal Carson is about to depart, in the long establishing shot he is wearing the white cowboy hat that he gave away earlier in the story. When it cuts to a close up, the hat is gone.
A helicopter that Marshal Bravestarr and his compatriots must contend with has no tail rotor. A helicopter without either a tail rotor or a counter-rotational rotor would spin from the torque of the main rotor.