I'm so happy that you guys noticed the little things in this. One of the biggest things that prevented me from doing this project sooner was the dialogue. For our first Shenmue film, all of the dialogue was ripped right out of the game (courtesy of Shenmue Dojo's audio files from YouTube). That kind of limited the story we could tell, because we basically had to make the film based around the existing audio.
For this one though, I just tried my best to do impersonations of the characters. Not only that, I really had to add on filters to get the audio to the same quality that I remember from playing these games on Dreamcast (just that really bad compressed sound).
It was both a blessing and curse to decide to dub this whole project. While shooting, it made things really easy because we didn't have to say all the lines as per the script, since the off lip-syncing was all part of the effect (and charm). But in editing, I gotta say placing the audio was the MOST TEDIOUS PART. There were a few spots that I got a little lazy with the audio, but hopefully nobody notices.
As for the characters, I knew that I wanted to use everyone from Enoki's and Goro's former gang. I knew those two other characters existed, as I remember that fight from the game. BUT, I didn't know what their names were. All I had was that one picture that had Enoki, Nagashima, and those other two guys in it. Had to look them up on the Shenmue Wiki page. I would've just looked them up in one of the strategy guides I had, but I couldn't find it to save my life.
Anyway, I am absolutely thrilled that you guys are enjoying it. This really was made for the fans, and I don't particularly care if it gets seen by non-fans. I just hope Yu-san and company catch this sometime too, as I'd love from them to see it.