Two glitches involving Bloatazin and his Relic can be found in Banjo-Tooie. (Not including the Undead Banjo Glitch)
Bloatazin Searching for Located Relic
After finding Bloatazin's Relic, go to the treasure chamber as Mumbo and speak to him. Once you are done speaking to him, Bloatazin will begin searching for the relic amidst the gold even though it has already been found.
Moving Bloatazin and Sacred Relic
Immediately after performing the above glitch return to Mumbo's Skull and gain control of Banjo once more. Return to the Treasure Chamber and Bloatazin will be dancing where you last saw him searching for the relic. The relic will have moved to that spot as well.