 As Lisa's grandfather, Douglas Powers was cast by Friedel due to his "evocative" face, as his character's facial expressions would serve as his only form of communication.Friedel recalled that the production sought to extend individual scenes "by any means possible" to give the film a longer running time, which included the extended opening and closing credits sequences.Some dubbing was completed in post-production, particularly for the scenes in the car, as the crew had no means of capturing sound in a moving vehicle.