Please help me understand S4 jokes

English is not my first language and I do not live in the US so I am missing out on the jokes/references.

In S4E1, what does Mr. Johnson mean by "Are we being audited?" Is it because of Ava's over-the-top speech on diversity?

In this scene: https://twitter.com/thatguygrimchim/status/1847460569563230410

What is the joke here that makes the scene extremely funny?

What is the significance of "I know that's wrong"? What does "I am not the one or the two" mean or is this just some wordplay (one two three)?

TIA!!!