When Little Harpe spells the name of the keel boat he refers to the letter Z as Zee. The movie takes place in 1810 back then Americans would have still been calling it Zed. Zee was not used until the 1830's.
After Davy and Russel are shot out of the canoe by mike fink. We then see a shot of the Gully Wumper as the camera pans to the right Russel is wearing his hat but in the next shot his hat is off and nowhere to be seen, the background also changes.