Revealing mistake: As one of the pilots opens a hatch to check on the failed "avionics" a side cockpit window is visible above and behind him. Rain on the window is moving directly downward, an impossibility at hundreds of miles per hour.

Snakes on a Plane (2006)
1 revealing mistake - chronological order
Directed by: David R. Ellis
Starring: Samuel L. Jackson, Julianna Margulies, Nathan Phillips, Rachel Blanchard
Factual error: One of the subplots involves a young boy ("Tommy") who is bitten by a cobra and the attempts to save his life. When they are working on his arm, it is horribly swollen & filled with fluid which they drain by cutting open his arm. Cobras secrete a neurotoxic venom which attacks the nervous system. It would not cause noticeable swelling at the bite site. The symptoms Tommy has would indicate a bite from a snake which secretes a hemotoxic venom (such as a rattlesnake), which attacks the blood stream & tissues, causing swelling.
Neville Flynn: Enough is enough! I have had it with these motherfucking snakes on this motherfucking plane!
Trivia: During filming, Samuel L. Jackson did not come into contact with any live snakes, because a contract clause prevented snakes from being within 25 feet (8 m) of the actor.





Answer: Rattlesnakes only make a noise when they are disturbed and some rattlesnakes will even strike without starting to rattle first.
Myridon