Pays tribute to Tokyo Drifter (1966) in the scene when Yamanaka is laying low on Shozo's turf, a jazzy version of the theme song from that film plays in the background. All the while Shozo is advising Yamanaka he should hide in Toyko to avoid the conflict between the two warring clans of Hiroshima--strongly similar to the story plot in "Tokyo Drifter". The scene ends with Yamanaka's boss calling to give him one final mission to set him up, similar to how Tetsu's boss calls his partner to rub out Tetsu in "Tokyo Drifter".