Continuity: Near the end, Gene Hackman's character is nearing the finish. The audio leads you to believe that the horse is breathing VERY hard, but when the camera shows the horse, the nostrils are NOT flared as they would be on a horse that has been run to exhaustion (or even down the block.) Also, the people filming this scene obviously have no clue about the nature of sweating in horses.  They showed "lather" all through the horse's mane. The ONLY places horses will lather while sweating is where something is rubbing, i.e. underneath the saddle, the bridle or breast collar, where the reins rub on the neck or between their back legs.

Continuity: The movie's about a race between several characters, starting in Colorado and going through Kansas. There's a scene with a Sahara-like desert, there are no deserts of that nature anywhere between Denver and Kansas City.