Briana Cuoco (who voices Barbara Gordon) is the younger sister of Kaley Cuoco (who voices Harley Quinn).
In a shot of the city there is a building that closely resembles the ATT building in Nashville, long nicknamed the Bat Building.
The Riddler takes over the university and makes himself the dean. Jim Rash voices the Riddler. He is famous for playing the dean of Greendale Community College in the TV show Community.
Barbara Gordon's dorm room has a large poster of Batman on the wall