Stupidity: Amongst the dubious statistics attributed to the real Frank Dux at the end of the film is the claim that he holds the record for "Most Consecutive Knockouts in a Single Tournament - 56." A single tournament with at least 56 rounds would include over 72,000,000,000,000,000 entrants.
Suggested correction: While the entire film could be considered fiction based on Dux's dubious claims, your statement is only valid for a single-elimination style tournament. There are other types of tournaments, such as a round robin which would only require 57 contestant (Dux plus at least 56 guys to knock out).
The kumite is a single elimination tournament. It wouldn't make any sense to have a full-contact tournament, where the action is so (legally) violent that fights routinely end in severe injury or even death, use any other form of bracket.
Nothing is stated that every tournament Dux was in was the Kumite as depicted in the film. Just that he retired undefeated in the Kumite.
The records listed at the end of the film are kumite records. The information comes from Frank Dux himself who made the claims on more than one occasion. When it says 56 consecutive knockouts, it is referring to the kumite and not some other, possibly round robin (which honestly would still be a ridiculous claim) tournament. It is likely the makers of the film believed "consecutive knockouts" meant "single tournament."
I guess everything I've read on him over the decades never made it clear it was talking about one type of tournament with all the accomplishments he's claimed to have. And I've read the same repeated factoid about how many contestants 56 rounds would have that you read.