New Screen and Extra Guy:
After beating the game you will get Lt. commander Chars pink zaku II on the title screen, you will also get Lt. commander Garret Schmitzer but the only thing that is wrong about him is that he only has one gundam on his team.

Unlocking Levels:
After beating the game you will unlock all the levels in the simulator mode. They are listed as programs.

Thanks to Revolution reader Steve Seymour!