- The Other Darrin:
- John Clark was played by Willem Dafoe in Clear and Present Danger, but the first game had him voiced by Douglas Rye instead.
- Between the two Vegas games, every voice actor except Jung Park's (Paul Sun-Hyung Lee) was replaced.note Particularly notable in that a lot of the characters in Vegas 1 had distinctive accents that, except for Michael Walter (from Isaac Singleton to Kwasi Songui), the replacement actors did not bother to replicate.
- Name's the Same: One of the major team members is (Eddie) Price, who is characterized as The Lancer in the novel. Like another, later well-known Price, he's an ex-SAS operative, now transferred to a multinational anti-terrorist team, with a magnificent mustache (the only member of his team to have one), a penchant for smoking (pipes in this Price's case, versus the latter's preference for cigars) which very few of his teammates share, and almost the exact same voice and accent.
- No Export for You: The South Korean-made game Take-Down - Missions in Korea. It was suppose to get a worldwide release, but it never happened.
- Recycled Script:
- The plot of the Vegas games is very similar to that of the Black Thorn Expansion Pack for Rogue Spear, though considering the obscurity of the expansion, it might have been accidental. The plot of Black Thorn involves an ex-SAS operator, who failed to get into RAINBOW (thanks to Cold-Blooded Torture, leading to mental problems), masterminding terrorist attacks worldwide to prove how good (and petty) he is.
- To a lesser extent, the plot of Raven Shield also bears some noticeable similarities to that of the original game and novel. Terrorist attacks bankrolled by a hidden villain who turns out to be a friendly face, stealthily wiretapping the home of a political figure to see where they stand, the presence of neo-Nazis, and a climax involving the potential release of a deadly virus at a famous national event that will spread the virus all around the globe - the motivations are the only thing significantly different, as the first game's bad guys were a Well-Intentioned Extremist group trying to save the environment by killing off the rest of humanity before they could destroy the Earth, while the third's was simply a dying old man acting on sixty-year-old hatred.
- Troubled Production: The original went through this, mostly due to Red Storm's inexperience with game developmentnote . This retrospective/interview describes the process in pretty vivid detail.
- What Could Have Been
- The first game in the franchise began life as a tactical shooter based on the FBI Hostage Rescue Team. It was changed to an adaptation of Tom Clancy's novel to give it more appeal to international audiences. Amusingly, the devs later got to basically make the game they originally envisioned; the Licensed Game to The Sum of All Fears puts you in the shoes of the HRT for a mission or two and plays very similarly to Rainbow Six.
- Before Siege, there was the unreleased Patriots with the basic premise being domestic terrorism, making split second decisions on whether that woman in civvies and wielding a gun is a threat or not, and having to make the call on whether a hostage with bombs strapped to him should be shot or risk terrorists using him as a suicide bomber. It even got a special weapon paint scheme in Ghost Recon: Future Soldier and another trailer showcasing Rainbow being trained in South Korea's head-first fast roping (virtually running down the side of a building) before the game disappeared completely.
Trivia / Rainbow Six