In the first Bloodfist movie Jake Raye had retired from fighting after loosing a kidney. In this movie is not only an active fighter, bet reign world champion.
When Bobby Rose shoots you count eight shots out of a six shot revolver.
When the fighters for the tournaments are having a fight with the guards when they first arrive to the island, some of the guards sticks can be seen bending back and forth, obviously made of rubber.
In one of the fights between Wilson and Su, when Su flips over a table you can see it was a breakaway table from underneath.