When the men are chasing the brumbies near the end of the film, Curly reaches over and pulls Jim's horse's bridle down from its ears. Yet, a second later when they ride through the water the bridle is back up where it should be. Later the bridle is pulled back down again and Jim stops to fix it.
When Jessica falls off the cliff, in lightning flashes in the darkness, her landing spot appears to be smooth and flat. The next morning, however, it is rough, uneven and sloping.
When Jim leaves the note hanging on the tree that Jessica is alright and heading back home, he leaves the bag with the note on one branch and his bandanna hanging on different branch. When Frew picks up the note later the bag and bandanna are hanging together on one branch.
Early in the movie, Jessica is shown playing a keyboard musical instrument which resembles a clavichord or virginal and sounds somewhat like a harpsichord, as it should. A little later, she is shown playing the same instrument but now it sounds like a concert grand piano.
When in the wild, the stallion has well groomed hoofs and horse-shoes that are clearly visible from the front view of the horse. If he had shoes on from when he was a colt then his hoofs would have out grown the shoes.
Jessica plays chords and melodies on the piano that would've been unheard of in the 1880s. They would not be invented until deep into the 20th century, and be typical of those used by performers like Carole King.
At the end of the film when the brumbies are being driven toward a holding corral, the mare Bess and the colt are way out in front. They're domesticated, and they'd know that the ranch meant food and water, so they'd be more eager to return than the others.
Near the end of the movie right after Jim drives the wild horses across the snow, you can see a man on a horse in the background. All the other men in the group are far away so this must have been a extra helping him herd the horses.
At the end of the movie when Jim gets Bess, the horse shown is a gelding instead of a mare.
At the moment Jim looks down at Jessica, who is on the ledge, his lips move as he says something, but there is no dialogue to indicate what it is.
After Jim falls off the "thousand-pound" colt, he looks up and sees the herd of brumbies heading straight for him. Two riders are clearly seen driving the herd to the left and right of the screen.
(at around 1h 35 mins) After the brumbies run through the snowfield, there are two men on horseback in the background.