As other reviewers have pointed out, Itami was stabbed by Yakuza after the release of this film. The reason: They felt it too realistic. I suppose they feared that if the public were to find out their "secret" methods of intimidation were just a bunch of hot air, so to speak, it would soften their scare.
And so when you watch this brilliant and dynamic piece of filmmaking, remember that for as outlandish as the characters and situations may come across on screen--as "over-the-top" as it may seem--there was enough realism in the portrayal of the Yakuza mindset to ruffle a lot of feathers.
Think about the fact that there are hundreds of Yakuza movies out there and that this one was the one to stir up outright violence. It's like a Japanese "Colors"; maybe not the most realistic film, but rather a representation that captures a certain animal instinct in some people--like bottled react juice.
Itami continued to provide strong roles for women in this film. And while I agree that this film is not as "wacky" as some of his others, it has just the right combination of farce and graveness to make it a gem.
Great movie, great director. 9/10