In the first episode of Afro Samurai, Ninja Ninja is visible through the binoculars.
In the Resurrection Director's Cut, at 17:15, when the camera zooms in on the Lady Luck Town billboard, there's a URL under the eye. Following it nets the viewer a cool computer wallpaper.
In Resurrection, in the gambling room scene, creator Takashi "Bob" Okazaki is seen fondling two strippers.
Tropes
Acting for Two: Afro and Ninja Ninja are both played by Samuel L. Jackson. And Ninja Ninja is Afro's imaginary buddy. Interestingly, while Jackson spoke with two separate voices for the two, during Ninja Ninja's dying scene in the first series, he reveals Ninja Ninja's imaginary nature by slowly changing his voice to sound more like Afro's.
Furthermore, Ninja Ninja introduces himself whenever Afro feels truly alone and with doubt (first time being after the fight with his master and him deciding whether or not to continue on with his revenge). However, he repeatedly interacts with the environment and has been noticed before.
Billing Displacement: Kelly Hu gets second billing in all the promotional materials. Her character shows up halfway through the story and dies about twenty minutes after her introduction.
Keep Circulating the Tapes: Revenge of Kuma was removed from PSN and Steam in November 2015. Since it was a digital-only title, this rendered the game almost impossible to obtain. While those who played it are relieved, those who wish to engage in Bile Fascination and didn't get it when it was available are gonna have to get a used PS4 or PC that happens to have it, and given the game's negative reception, good luck finding one. The only alternatives are dubious in legality at best, and it's very likely to stay that way. What sealed the game's fate once and for all is that it's one of the very few PS4 games that's incompatible with the PS5, even via a data transfer, meaning the game is forever stuck on the PS4 as the only legal way to play it on any console.
What Could Have Been: The commentary and bonus pages in the manga show what could have been.
Most noticably, Afro's 'fro was neon green. It's still got a greenish tint if you look real close, but nowhere near as green as it was; this is referenced in the first part of the first film.
After the extent of Michael's mechanization is shown, and considering how long it took to reveal him, he got cut down pretty easily. A storyboard in the art booklet that comes with the director's cut of Resurrection shows what appears to be Michael using his chains to fling himself at Afro, even though he's somewhat stationary in the movie. It can be inferred that the creators originally intended to make Michael more mobile and lethal, but for whatever reason, didn't.
Revenge of Kuma was not only meant to have its own sequels, but an Xbox One version was also supposed to be released. The game's icy reception ensured this never happened.
