its not so big filler. it makes you wonder where ginyu ended, and, what bulma did. it's ok. oh, and, in Manga, bulma says, when freeza arives with father - i did not see him on Namek, i wanna see this Freeza, and if you say he is strong, what's the point of hiding ?
anyway, it shows us that the "soul" exists in DB universe, and, that a body can be controled when one knows how to do it (flipping in air, by Ginyu in bulma's body)