In From Russia with Love, Bond refers to a Noodle Incident involving himself and M in Tokyo. But in this movie, he tells Henderson he's never been to Japan. This seems like a continuity error, but considering M's freaked reaction when Bond mentions it in From Russia with Love, it's entirely possible the entire incident - and Bond's trip to Tokyo - is officially denied!
Bond being targeted by Chinese agents (note the 'Peking Duck' quip that Bond makes to the Honey Trap) makes sense when it's implied that Red China is behind the whole plot. According to the British ambassador Bond was following up on the missing rocket case there, so the Chinese were probably worried that he was on to them.
Why does SPECTRE send out four helicopters to deal with a small autogiro? Also, why do the pilots keep fighting Bond when it's clear Little Nellie has them outgunned? Because Bond's flying over their primary base: better make sure he *does* go down. Also, for the pilots: flying back and reporting to their superiors they've failed to shoot down the interloper would guarantee a quick and final swim in the piranha pool. Might as well take their chances fighting Bond.
Blofeld planned to blow up the SPECTRE spacecraft once it had captured the American craft. Bond was planning to go up in the SPECTRE craft. Taking his oxygen with him saved his life.
