While in town, Bill Hawks sees Julie by herself and tells her he will take her back to camp, if Flint doesn't show up. He then walks away. After that Flint comes out and he and Julie leave for the camp, but when they get there, Bill is already there, eating.
When Flint gets knocked out in the saloon, he lands face down. When the camera angle changes, he is face up.
The ship mentioned, the "Delta Queen", wasn't built until 1927.
When unconscious Flint is picked up by the two thugs and his legs are stiff. Being unconscious, all his limbs should be loose.