When Flicka jumps out of the trailer she has a halter and lead on, she then runs into a paddock trots and rears without a halter and lead, the people catch her from the paddock and she has a halter and lead on again.
At the start of the charity dance and auction, the music that is played doesn't match up with what the camera shows the band playing. In particular, the drummer of the band is shown playing his drumkit, but there is no sound of the kit being played.
The horse Flicka is referred to multiple times as being a Mustang, but it's clearly an Arabian.