The examples of propaganda we can found in the passage provided are2. Napoleon talks to the animals through Squealer; and 4. Squealer uses glittering generalities to describe Napoleon's tactics.
Napoleon talks through Squealer. Squealer in the novel is the one pig who has a connection with the rest of the animals. Napoleon makes Squealer manipulate information to the animals so they won't doubt Napoleon and rebel. This is known in propaganda as Transfer.
Glittering generality is when someone makes other people accept or approve something without giving them concrete evidence. On the passage above, Squealer credits Napoleon for inventing the windmill, which was actually Snowball's idea. All the positives things happening on the farm are credited to Napoleon, even though the other animals remember that he had been firmly opposed to building the windmill. Now Squealer says the plans had been stolen by Snowball from Napoleon's papers.