During the Depression locals would carve human tracks next to the "real" dinosaur tracks and sell both sets of tracks. This conviently explains the existence of the humanoid tracks to the scientific community.
Still some residents such as Mr. Jim Ryals reports chiseling the humanoid tracks from the riverbed to sell. He told investigators how they could tell the real tracks from the fake:
Unfortunately, for the paleontoligist, a large number of the same prints have been found in areas of the riverbed normally submerged. In 1976, Jack Walper, professor of geology at Texas Christian University, and John Green examined areas of the submerged riverbed by using dikes and pumpes.They found a number of dinosaur and humanoid tracks.
So, anyone wishing to create these tracks would have had to carve away a large area of rock around the print to leave the ridge of fosslized mud the pressure of the foot would create. They would have also had to do all of this underwater.
If we could walk with the dinosaurs...