Detectives Reiner and Nozaki are lovers
Funny sequel, I rate it No 2-3, after 1st and Death Wish 5. Fine combination of Fantômas-leke disguise and North-Northwest/Charade-like trick with empty places... The most important trick in the script, though, was stolen from Bugs Bunny cartoon - divide and conquer technique.
Congratulations to the script maker Gall Morgan Hickman.
Bronson probably did not notice, otherwise he would have refused the script, but detective Reiner was in love with his colleague Nozaki: it was obvious from his desperation after he had found out for Nozaki's death. To see him holding that face for the rest of the movie was hilarious.
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"This shampoo is too strong!"