These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The Judi Dench take on M is easily the most memorable version of the character and has received gradually more screen time as her time in the role has continued. Notably her version of M survived the full continuity reboot into Casino Royale.
Franchise Original Sin: Everything that went wrong with the series pre-reboot was in evidence in mild form as early as Goldfinger. This is "original sin" in more than one sense, as all those things were inherent to the series' character pre-reboot — enough so that the films with Daniel Craig simply don't feel like James Bond films to some viewers. It runs the other way as well, though not as drastically — Dr. No feels closer to Quantum of Solace than Goldfinger in some respects.
Values Dissonance: Instead of spending all day here, let's just say "Early Bond" + "Women" (note that the books have other value issues as well, but the women are most prominent). Roger Moore even looks uncomfortable attempting to imitate such works in The Man With the Golden Gun.
Trapped By Mountain Lions: As a part of Ian Fleming's apparent obsession with food and high-class living, many of the books take detours from Bond investigating a world-spanning conspiracy to describe him having lunch. In great detail.
In The Man with the Golden Gun, M reads a psych report speculating that Scaramanga is gay because he uses a large calibre gun.
Communists are never up to any good. Bond likes but patronizes Blacks, hates Koreans but loves the Japanese, and thinks "sex equality" has fostered bisexual misfits. Homosexuals cannot whistle.
In Goldfinger, Pussy Galore's a lesbian, and Bond bangs her into righteousness.