Mud says that the same snake antivenom cannot be used twice on the same person. While it is true that repeated use of first-generation antivenoms can cause severe allergic reactions, modern antivenoms can be used repeatedly safely.
When Neckbone calls Mud for help
after Ellis falls into the snakepit, Mud grabs his shirt off
the limb, sticks his arms in, and takes off running with
the shirt unbuttoned. In the next shot as Mud runs
towards the camera, his shirt is fully buttoned.
Ellis and his mom come across a
roadblock and police checkpoint of State Troopers
checking cars for Mud. The Arkansas State Trooper that
comes up to the window is wearing the wrong uniform.
His badge is wrong, and his shirt is wrong. He has one
of the cloth badges on his right shoulder, but it is the
wrong shape for State Troopers. And he has an
American flag on his left shoulder. Arkansas State
Troopers have the cloth badge on both shoulders, not
an American Flag.