The morning after Sarah gets her tattoo (done with a chisel), her chin is completely smooth and healed. In reality, her face would be quite swollen with open cuts for some time after.
The movie is set in the 1860s, but the lyrics to "Danny Boy" as used in the film were written by Fred Weatherly in 1911.
The film takes place in the early 1860s, but the wedding dress Sarah finds is a style not worn until the 1880s.
In one part of the film where the camera pans along the river, there is a distinct sound of a Kea- these are alpine parrots which do not inhabit the Whanganui region now and most probably didn't then either.
The jerk rig rope attached to the stunt man is visible during the ambush.