What three ways did Animal Farm not live up to Old Major's goals?

The main way Old Major's predictions and goals fail to reach fruition is that his dream was an animal world where all animals--even rats--were considered equals.  They do reach a world where animals live with and for each other, but the motto doesn't stay "All animals are equal."  It morphs to "All animals are equal, but some are more equal than others."  The pigs obviously believe that because of their intellect, they are above and beyond all other animals.  This is a major flaw in the goals Old Major had in mind.