The Badlanders (1958)

Factual error: As the stagecoach rolls into Prescott, Arizona, the road winds among hundreds of Saguaro cacti. Prescott is far beyond the northern limits of the Saguaro.

The Marshal: Oh, that suite is taken. So is every room in the hotel. And every other hotel in town. You might try the stable across the bridge.
Peter Van Hoek: I like horses, Marshal, but not as roommates.