Onua is a hunchback, but when he and the other Toa descend into the Makuta's realm, for a few shots he suddenly has the same body-built as the non-hunchbacked Toa.
After the Toa go underground to face Makuta, their golden masks revert back to their original colors in random shots.
One of Onua's fingers is awkwardly stuck pointing forward in several shots before the Toa combine into Toa Kaita.