Other mistake: After the failed marriage between Jo and Jack, there is a shot of a cliff. Notice that the clouds moving overhead simply disappear into thin air.
Jimmy Mitchelson: He wants to marry his sister.
Freddy: He better not come back.
Jimmy Mitchelson: Yeah, that's right, or we'll tie you to a tree, fuck you in the ass while we jerk you off. Show you what we really do to perverts around here.