Inspiration for the Work: In March 1956 Fleming and his friend Ivar Bryce accompanied Robert Cushman Murphy (of the American Museum of Natural History) and Arthur Vernay (of the Flamingo Protection Society) on a trip to a flamingo colony on Great Inagua in the south of the Bahamas. The colony was 100 square miles (260 km2) of dense mangrove swamp and salt flats, home to flamingos, egrets and roseate spoonbills; the location inspired Crab Key.
Terence Young, who once had turned Lois Maxwell down on the grounds that she looked like she "smelled of soap, not sex", offered her either Moneypenny or Sylvia Trench, but she was uncomfortable with a revealing scene in the screenplay. She ended up playing Moneypenny. This paid off down the line as she was childhood friends with Roger Moore, giving them fantastic chemistry.
Marguerite LeWars was originally considered for the role of Miss Taro, but she thought the part was too risqué, so she was cast as Annabel Chung, the photographer instead.
We Don't Want a Doctor/Dr. No: 007 Is The Killing Number (Japan).
Licence to Kill/Agent 007: Licence to Kill (Italy).
James Bond Versus Dr. No (Belgium & France).
Dr. No: Mission-Killing/Agent 007 - Mission: Kill Dr. No (Denmark).
James Bond Chases Dr. No (Germany).
Agent 007 With A Licence To Kill (Sweden).
Agent 007 Versus Dr. No (Spain).
James Bond, Agent 007 Against Dr. No (Greece).
007 Seized The Secret Island (China).
007 - The Secret Agent (Portugal).
007 And Dr. No (Finland).
007 Against The Satanic Dr. No (Brazil & Spanish-speaking South America).
Darkhorse Casting: Ursula Andress was cast because she fit Albert R. Broccoli's description of "an unknown with a new face who wouldn't demand an outrageous salary." Seeing a photograph of her in a wet t-shirt obviously didn't hinder that decision either.
A sequence extracted from the final cut had No forcing Bond to radio Felix Leiter, telling him that he had discovered nothing of any interest on Crab Key in return for a less painful death for both Bond and Ryder.
A cut scene featured Honey Ryder waiting in her room in the finale, armed with a bottle of booze. When Bond arrives, she collapses into his arms and Bond catches both her and the bottle. With a manly dash, he pops the cork from the bottle with his teeth, takes a good belt, throws the bottle away and sweeps Ryder into his arms, carrying her to safety.
Enforced Method Acting: Sean Connery is truly terrified of spiders. The arm of a stuntman was used when the tarantula crawled onto Bond. Note the shot when the spider is on his shoulder — it's walking on a pane of glass. Once you've seen it you can't unsee it.
Every single woman in the film (barring Lois Maxwell, Yvonne Shima & Michel Mok) is overdubbed by the same actress, Nikki van der Zyl.
Several of the male supporting parts were looped by Robert Rietti.
During the initial briefing, M says that he recently was put in charge of MI7. Bernard Lee originally said MI6 during the take, but this has been overdubbed, possibly for fear of offending the real-life organization. In later Bond movies, however, 007 clearly works for MI6.
Louis Blaazer (Pleydell-Smith) had a thick Scots accent that producers thought didn't fit his character, so he was re-dubbed with a posher Home Counties accent.
No Budget: People usually think of James Bond movies as multi-million blockbusters, but it all started pretty... humbly.
United Artists only lent $1 million to make the film (in 2018 dollars, this amounts to about $8.4 million). The art director got some extra cash from the producers' own pockets, and the special effects people convinced UA to give an extra $100,000 to do the Collapsing Lair. For comparison, the budget for the most expensive film in the franchise, Spectre, was anywhere between 245 and 300 million in 2010s dollars.
Due to the low budget, only one sound editor was hired (normally there are two, for sound effects and dialogue), and many pieces of scenery were made in cheaper ways, with M's office featuring cardboard paintings and a door covered in a leather-like plastic, the room where Dent meets Dr. No costing only 745 pounds to build, and the aquarium in Dr. No's base being magnified stock footage of goldfish. Furthermore, when Art Director Syd Cain found out his name was not in the credits, Albert R. Broccoli gave him a golden pen to compensate, saying that he did not want to spend money making the credits again.
Owing to the limited wardrobe budget, Lois Maxwell wore her own clothes as Moneypenny, as did other actors in similarly small parts, and the Rolex watch on Connery's wrist was Broccoli's own.
There was no financial possibility to ship a luxury car to Jamaica. The Sunbeam Alpine Series II Connery drives in the film had to be borrowed to a local resident. According to the producers, it was "the only decent sports car on the island".
Non-Singing Voice: Ursula Andress had a singing voice actress, Diana Coupland, then-wife of composer Monty Norman.
Orphaned Reference: The charred trees in the area where Bond confronts the Dragon Tank are part of the sanctuary for rare birds that Dr. No has disrupted. All mention of the sanctuary was deleted from the final film.