What are some examples of allusion and irony in this book?

There is The Battle of the Cowshed as an allusion to the Russian Civil War.

THe irony that the animals control over the farm was worse than Farmer Jones.

Mr. Frederick allusion to Hitler

Ironic the most effective "pig" for the farm, Snowball, is chased out as a traitor.

I have a really old copy of this so pg. numbers won't really help you.