When Tigerman and Buck fight the symbolic duel, near the end Buck elbows Tigerman three times in the stomach and then throws Tigerman over his head. As Tigerman goes over you can see Bucks belt fall off. Next, where he is twisting Tigerman's wrist and telling Pricess Ardala he 'will not kill him' the belt has reappeared fastened around him.
Obvious stunt double for Gil Gerard during fight scene with Tigerman.
When Buck was in the weapon control room to destroy it, the display screen still showed a view of being in Earth orbit, but the weapon was outside the Draconian ship at the time away from the Earth.