Bad Grandpa .5 offers a fresh insight into the universe of Irving Zisman, showcasing additional scenes and pranks. It includes appearances by Spike Jonze as “Gloria” and Catherine Keener as Irving’s spouse “Ellie.” The film also explores the development of Johnny Knoxville’s mischievous character, delves into the makeup effects, and provides a behind-the-scenes glimpse into the absurdity involved in creating a hidden camera film in public settings.