More of irony than allusion, but Jay's breakout role in his native Taiwan also involved hard-and-fast driving in a Live-Action Adaptation, as Takumi in Initial D. The scene with Kato playing with a basketball also alludes to Jay's earlier movie, Kung Fu Dunk. And the massacre of several gangsters just for wearing green parallels a plot point from Curse of the Golden Flower. This is basically Meet Jay Chou: The Movie.
James Franco as a meth dealer. What was his last movie with Seth Rogen? Pineapple Express.
Creator Backlash: Seth Rogen has recently admitted that the making of this movie, and its subsequent failure, was a "nightmare," adding that he'd "sooner not work for a year," then do a sequel. Michel Gondry also recently bemoaned his lack of creative freedom on the film, and regrets directing it.
Some actors like Edward James Olmos, however, enjoyed working on the film.
Dyeing for Your Art: Seth Rogen trimmed down noticeably for this role, even looking a bit gaunt after his 11-day coma (though that's probably down to lighting).
Fake Nationality: Kato in the radio series, film serials, and television series. While the first radio actor to voice the role was apparently Japanese (Raymond Hayashi), American Roland Parker voiced Kato for most of the series run (as his nationality shifted from Japanese to "generic Oriental" to Filipino), while American Mickey Tolan played the role towards the end. In the serials, Kato's nationality was specified as Korean, but the role was played by Chinese actor Keye Luke. And in the TV series Kato was (presumptively) Japanese (though some sources say that producer William Dozier conceived of Kato as being Korean) but played by Chinese actor Bruce Lee.
Marathon Running: Syfy aired a 13-hour marathon of the series on Jan 11, 2011 to promote the Movie adaption opening later that month.
And on St. Patrick's Day 2012, Me-TV ran a "Viewing of the Green" marathon of the series.
And on the weekend of November 7 & 8, 2015, the entire series was run multiple times for that weekend's "Decades Binge" on that network.
Technology Marches On: Today, the Black Beauty's aerial scanner feels remarkably more current than anyone could have guessed back in the 1960s with aerial drones becoming increasingly popular consumer items.
What Could Have Been: Van Williams, among others, pushed to give Bruce Lee more to do in the TV series since it was obvious that he was garnering the most viewer interest with his martial arts moves, preferably in a hour format. The producers wouldn't budge and the series was cancelled earlier than it could have been.