Bats

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.

Continuity mistake: Near the beginning of the film when the sherrif is smoking a cigar and talking on the bridge, the cigar changes position every time the camera cuts between a close-up of him and a wider shot.

More mistakes in Bats

Jimmy Sands: Clip their wings? Man, could you just shoot their damn heads off? And don't miss.