In all English-dubbed versions of the film, the rock and roll theme song titled "Great Giant Beast Gappa" (heard in both the opening credits and the ending of the original Japanese version of it) is replaced by standard orchestral music. Also, the Japanese version features a song titled "Keep Trying, Baby Gappa!" (heard in the scene at the end of the film where the male and female Gappas are reunited with their baby). In all English-dubbed versions, the song's vocals are cut and thus, it becomes an instrumental song.
