The spear-launching tool used In the movie is called an "Atlatl". Spear-throwers appear very early in human history in several parts of the world, and have survived in use in traditional societies until the present day, as well as being revived in recent years for sporting purposes. In the United States the Nahuatl word atlatl is often used for revived uses of spear-throwers. Australian aboriginals called their spear throwing tool a Woomera. It is still used by traditional owners in rural areas of Australia, and was in common use by first people throughout the country only 230 years ago.
Director Anders Engstom was replaced by Robin Pront.
At the beginning of the movie, the Sherriff (Annabel Wallis) gets a call on the radio. When she answers she speaks into the wrong side of the mike