The correct answers are: the corruption of those in power, propaganda spread to induce confusion, Stalin's attempt to expand industry.
Indeed, when Napoleon (Stalin) starts pretending that he had originally thought of Snowball’s (Trotsky) windmill and that he only opposed it on tactic grounds this is clear example of the propaganda techniques the real Stalin used to completely discredit Leon Trotsky and ban him from the Soviet Union. The windmill represents the Five Year Plans for the national economy of the Soviet Union. Initially, Stalin opposed them, but later on he supported them and pretended that they were his creation. The Russian people were very confused by all this infighting and Stalin not only got them confused with all his falsifications, he also provided them with a simple version that they could cling to in order to have some understanding of the reality around them (propaganda). He also used this propaganda to get Leo Trotsky removed from power and banned from the Soviet Union.
Finally, the Soviet society was divided between an official, privileged nomenclature of apparatchiks that enjoyed far more power and standards of living that any regular Soviet citizen. The system eventually became as corrupt as the previous czarist system they had overthrown. Regular citizens were under rationed food and supplies while the Soviet elites were feasting on the riches produced by the Soviet people.
