Release date wrong.
I've seen the release date listed as 1973 both here and other places. First off, considering Lee died in '73, they would have really had to rush this one out for a release date that year. Not to mention all those Bruce Li, Le and Dragon Lee film cilps would have had to been shot when Bruce Lee was still alive.
The other big clue I have is the music that is looped through out the film. It's "Devil's Gun" by CJ & Co. and it wasn't released until 1977. I'm guessing '77 is the right year. I've seen other sites list this as well.