Goofs

The six-shooters are never reloaded but they never run out of bullets. This is a common trope in Western movies, and seems particularly appropriate for a "tall tale" where everything is exaggerated.

When he makes his debut, Pecos Bill shoots off two varmints' "trigger fingers" before they can shoot Daniel and you can see that they are gone. But when they put their arms and hands up they still have their trigger fingers.

Plot Summary says: "A young boy's imagination...". That scene did not actually happen.

In 1905, John Henry tells of an argument he had with his father before the father was sold down the river. This would have to have happened well before the last pocket of American slavery was abolished in 1865. Given John Henry's apparent age, he would have been a toddler at most, and too young to have a coherent discussion with anyone. (There are hints that he is a supernatural being who transcends time, but the movie is not consistent about this.)

Plot Summary says: "A young boy's imagination...". It isn't supposed to have a historically accurate timeline.

Calamity Jane is depicted as being active in 1905. If this is meant to be Martha Jane Canary, the most famous person to use the moniker, it is problematic because she died in 1903.

Plot Summary says: "A young boy's imagination...". It isn't supposed to be historical fact.