The orphaned Bo was counseled by Virgil to find a girl while attending a rodeo in Arizona:"Bo, you're 21 years old and we're on our way o a big city, Phoenix, Arizona.[Note: An Arkansas state highway sign, reading Arkansas Rte.49, was inaccurately positioned on the Mississippi side of the river.In actuality, there was no State Rte.49, only US Rte.49.And the real-life Sparta was nowhere near the state border with Arkansas, although it was clear hat the film's Sparta was only fictional.[The illusion of its rising is created by the descent of some of the backdrops.] As they are about to explore, a violent explosion (volcanic?) sends them in all directions.To rest their fatigued bodies after a "rough trip," they stretch themselves out on the ground under blankets.Surviving the river's triple falls, they entered a cave through another misty waterfall and studied cave paintings (one showed thirteen alien beings with elongated skulls in a circle).