Yes my mare is about 14.3 hands, 10 years old. The term "Brio" refers (generally) to a spirit and willingness to please under saddle which is inherited from the Spanish horses (Andalusian, Barb, Friesian, etc.). The Peruvian Paso is generally "unremarkable" as they are standing around in the pasture, except for their long manes & tail. However, when they are being worked in round pen and especially under saddle they come alive and offer their spectacular motion.
They are not unmanageable by any means, they have been bred over many generations to offer a smooth, safe mount that is willing to travel long distances with great conservation of energy. They just like to "GO" once they are under saddle; and, they have a soft mouth.
Don't remember the horse in the movie, fellerbarnone. Saw it years ago, though.
Peruvian Paso is slow to mature and is not started in bit until 3 or 4 years old. Bozal & four reins training (under saddle) at about 2.5 to 3 years old.
One of their famous showy images is that under saddle when you look at their topline and the rider's body, there is very little evidence in up/down movement (there is a "Champaign Class" in shows where the rider carries a filled glass without spilling any--or very little). And, this is done in their normal, collected gait.
Gaits are 100% inherited among pureblood Peruvian Pasos...evidenced hours after birth, as the foal experiments with different gaits and their legs.