Ensemble Darkhorse: Mr. Wint and Mr. Kidd. Various shows have parodied the characters and there's even a jewelry store in London named after them.
Fridge Brilliance: The two fakes both refer to him as 007; the real Blofeld always calls him "Mr Bond". In fact, throughout the series, Blofeld nearly always refers to him as "Bond" (or some variation thereof).
Bond uses a voice changing machine to intercept Blofeld's order to Bert Saxby to kill Willard Whyte. But then Saxby still shows up to do the job, making one wonder how he found out about the order. Since Blofeld noticed something odd about Saxby's voice, he may have called Saxby back, Saxby said he hadn't called Blofeld and Blofeld figured out what was going on. This is helped by the fact that he also moves up his plans by a day and leaves for the oil rig as soon as he can.
Due to a deleted scene one is left to assume that Plenty O'Toole quite possibly had to return home without her clothes (see below).
It was good that Lana Wood (Plenty) and Jill St John (Tiffany) barely had screentime together, given that both women and Robert Wagner allegedly had a falling out over Lana going to the media with her version of the events that led to the drowning death of Natalie Wood.
The sexual humiliation that Plenty endures in Bond's hotel room may not sit well with today's audiences either.
Harsher in Hindsight: On a related note, the one scene that Jill St.John and Lana Wood appeared together in had Tiffany Case go into her house, finding Bond standing by the swimming pool and Plenty drowned in the middle of the pool.
Lana Wood would later play the lover of an evil demon played by Kabir Bedi, who plays the evil henchman Gobinda in the 1983 Bond film Octopussy. The film being Satan's Mistress (also known as Demon Rage).
Magnificent Bastard: Blofeld made good use of decoys this time around. He used not only one, but multiple decoys of himself and when Bond meets him and a decoy later in the film, not knowing which is which, he scares the cat and kills the one it runs into, but it turns out the cat was a decoy too, the real cat had a diamond collar, as seen in the intro. Well played, Blofeld.
The cremation scene. Getting cremated alive has got to be the most horrific way to die imaginable.
The music playing during that scene hardly makes it better.
The poor Chinese soldier's death by Kill Sat above. He got set on fire and died being burned alive.
Plenty being caught almost completely naked... and then drowned, with the camera helpfully panning down her body towards the large weight she was tied to as slowly as possible.
Older Than They Think: Many fans complained that Blofeld had a full head of hair in this movie instead of his iconic bald appearance of the previous two films. In fact, Blofeld did have hair during his appearances in From Russia with Love and Thunderball, though it's difficult to see due to his face being obscured in those films. On top of that, the literary version was also described with an appearance close to that of Charles Gray in this film; in fact, the only reason why the screen Blofeld was ever bald was that Donald Pleasence happened to be bald himself.
One-Scene Wonder: Plenty O'Toole. Even more so after she decides to let Bond deprive her of her clothes.
Sequelitis: It's widely considered Connery's weakest and among the low points of the series for its campy tone and delirious plot.
Connery's increased salary for the movie meant that a cheaper effects company had to be used to cut costs, and it shows with the exploding helicopters at the end and the Kill Sat laser beams and its effects towards the end of the film.
During the chase scene with the moon rover, you can see a wheel rolling on screen just after the rover goes off camera. This is because they crashed the rover.
The Kill Sat itself, which somehow manages to look worse and worse in each shot. In the shots of the rocket launching and separating it actually looks decent, at about the standards of the similar sequences from You Only Live Twice. By the time it takes out a Chinese military base, the effects standard has dropped to being barely above a contemporary episode of Doctor Who.
Stop Helping Me!: Case accidentally puts the real tape in the machine (after Bond had switched it out for the fake), and is caught trying to switch it back.
They Just Didn't Care: It's quite obvious that Connery was only in this one for the giant paycheck, especially when he's visibly struggling to keep a smirk off his face while Bond is playing a grieving brother.
Willard Whyte has installations all over the place; Alaska, Florida, Maine, Oregon, Texas, Baja — wait, he doesn't have anything in Baja? The villains could've set up anywhere along any coastline, and they choose the one place Whyte knows he doesn't have any property? And then they mark their secret base on Whyte's map?
The biggest problem seems to be not that they used Whyte's name to buy it, but that they built a model oil rig and put it on his giant floor map of property. Nobody exactly comes up to see Whyte, and those who have access to the room and know about the purchase likely wouldn't question the lack of a marker simply because it's not a big deal (and those who have access are probably in on the plot to hold Whyte hostage anyway). Literally the only person who would actually notice them marking their secret base is the person who could blow the lid on the whole operation. Had they not bothered marking the purchase, they'd have had to search every location on the map and give Blofeld all the time in the world to laser cities.
How Plenty O'Toole got herself into her chilling fate, which has been a mystery to fans and viewers for years. Plenty's unfortunate send off was the result of a deleted scene where after getting thrown out of the hotel room and into the pool a soaking wet Plenty, wearing nothing but a white Modesty Towel and carrying her purple high heels (it is not addressed whether or not she still has her iconic transparent pink panties) returns to Bond's hotel room in the hopes of retrieving her clothes and seeing what's happened to him - and is positively outraged to find Bond having sex with Tiffany Case. Before leaving in a huff Plenty rummages through Tiffany's purse and finds her address, so she later went to Tiffany's to get even. It didn't go well for her... A bit of unintentional yet amusing Fridge Horror here is that without this deleted scene one is left with the idea that Plenty possibly had to return to her home WITHOUT her proper clothes.
The Scrappy: Jack and Seraffimo are easily the least liked of Fleming's main villains, being completely mundane gangsters with completely mundane motives. It's probably telling that they're the only Fleming Big Bads never to have been adapted to film.