Originally Iris Martindale had a much more humorous demise scripted. Iris was suppose to be lured into a quicksand pit by butterflies, where she was to drown. The scene was shot, but it was deemed too silly for the final film. The scene was re-shot to have Iris killed by a rattlesnake instead. Clips of the original death scene can be seen in the films trailer.
Because of the film's poster art, which depicts a human hand hanging out of a huge frogs mouth, it is often misconstrued that the film is about giant man-eating frogs rather than about swamp wildlife on the rampage.