At the final match (Keller vs Shreck) Keller takes off his black vest when they get into the ring. Just after that we see Keller looking at Shreck for a second, wearing the black vest again.
During the final fight scene, when John jams the pen into Schrek's ear, and then kicks it, it alternates very rapidly between two shots, one where Schrek is holding his ear in pain, and another where his arms are at his sides. It is obviously two different takes of the same scene badly edited in together.
When the warden is talking to Caesar, he leaves, very nervous. He is breathing very heavy. He is breathing so heavy that it leaves condensation on the camera.
During almost all of the fight sequences, it can be clearly seen that there is no impact made.
When Schrek is in jail, John Keller comes in, talks and hits Schrek. The hit is obviously a miss as Keller was standing way too far back.
When Caesar speaks, the voice is not in sync with his mouth.
When Schrek is breaking Billings' arm on the floor, a regular microphone can be seen near the bottom of the screen (not a boom mic).
This movie was filmed in Bulgaria. Virtually every last detail of the movie, from the architecture, to the culture, to the extras obviously reflect Eastern European influences. Yet, the movie is set in America.
There is very little plot continuity between this movie and Bloodsport III (1996). Although it is the same actor in the lead role, the character has changed from Alex Cardo, an ex-con turned reformed martial artist who competes in Kumite, to John Keller, a decorated police officer. The only plausible explanation is that the story from the previous movie is a wash. What makes things even more confusing is that at the beginning of the movie, John speaks of remembering a time when Kumite meant something, possibly indicating he has a history of competing in Kumite. Since Kumite is an illegal underground martial arts event, he could not have possibly have competed in the Kumite and been a decorated police officer at the same time.