Revealing mistake: When they are about to start that freezing machine, the dead body where they took the key from still looks fresh as compared to the others they examined that are in an advanced state of decomposition.
Bats (1999)
1 revealing mistake - chronological order
Directed by: Louis Morneau
Starring: Lou Diamond Phillips, Dina Meyer, Bob Gunton, Leon
Factual error: When Sheriff Emmett Kimsey (Lou Diamond Phillips) and Dr. Sheila Casper (Dina Meyer) enter the mine shaft and fall down into the cavern full of guano, they light a flare. The flame would have caused the fumes to ignite.
Jimmy Sands: There. Now it's securer than the god damn Alamo.
Sheriff Emmett Kimsey: Bad example there Jimmy.