Additional footage fleshes out the character dynamics, particularly the interactions between Shinji, Rei, and the newcomers.
The "2.22" designation refers specifically to the home media (Blu-ray/DVD) release, as opposed to the "2.0" theatrical version. This version includes: Evangelion- 2.22 You Can -Not- Advance - BDrip....
Evangelion 2.22 introduces significant changes that fundamentally alter the story's trajectory: particularly the interactions between Shinji