The Juasic Park movies were complete wrong with the Velociraptors size, they were only right that they were smart and social animals, hunting in groups like wolfs. It was a misunderstanding, because the paleontologist, asked by the size, said 6 ft, but they meant from the head to the tip of the tail, not the height of the animal, like in the movie, which were not bigger than a turkey.

Same as with the T-Rex following the car in the movie, the T-Rex couldn't run so fast, the biomechanic calculation and the weight has shown, that the max speed of the T-Rex couldn't have been more than ~15-20 kmh, he was probably more of a scavenger than a hunter.