The Revenger Squad reveal their superpowers when one of their youngest turns twenty-one and receives his own powers.
Barna, the character of Karla Estrada, is a play between Barney from The Backyard Show (1988) and Darna (1951). Both Vice Ganda and Estrada has been toying with the name even years prior to the movie.
The heroes believe that to help Gandarra get her memories back, they need to bash her on the head to undo her amnesia, which they do. But in the previous scene, they had repeatedly bashed her in the head, and nothing happened.