 CONT: In the scene where Anne and Tom first ride the horses  together, Annes hat varies from being on her head (with the obvious  stunt double) to not on her head when they showed the closeups of  her face. At the speed of the gallop, it is unlikely to be explained  by her constantly putting it back on and in the final still of that  scene, her hat is on again, and the hat strap is clearly in place to  prevent the hat from falling back.