In some scenes the dialogue is repeated or dubbed. When the second airboat arrives the same lines are repeated, even though the actors are laughing and pointing, the dialogue doesn't match any of them.
We'll set up over there, on the high ground.
Billy: I'm sorry, Mr. Gunter but as I told you before, I can't go beyond this point.
Sam Gunter: Don't tell me you believe those ridiculous stories about evil spirits and witch doctors that turn themselves into giant ...
Billy: I'm ...