Acceptable Targets: A slight one for Mormons. There's a bar named 'Grilled Mormons': in Japanese, this is a pun on a type of offal dish called "horumon", with the first letter changed to "m".
Crazy Awesome: The protagonist, who, after quitting his job and divorcing his wife, found a bunch of money, beat the living the crap out of several yakuza, rigged a pachinko machine, masterfully performed at a karaoke bar twice, decided to go treasure hunting after finding a map which then led to him flying down to the island on a glider while blowing UFO's and tops it off by killing pirates and bugs.
Hilarious in Hindsight: The creator of the game in the ending basically takes a jab at people who dedicate so much of their time just to finish a video game and find all of its secrets no matter how bad the game is. This is before the time of players that play to find every hidden Easter Egg and developers making their games catering to that type of behavior.