- Actor Allusion:
Pigma: My beautiful reward!''' Gyaaahhahahaha...!Cunningham: Why, Snake...? If you'd just gone home to America, you and I would have been given the '''highest honors a soldier can achieve.
- This isn't the only time Daisuke Gori played someone who defected to another group and sold out his allies. Although unlike Pigma, who was motivated by greed, Cunningham was motivated more by revenge, and given what he had to go through thanks to his allies/group, the CIA, its kind of hard to blame him for wanting revenge. Here's a quote from Pigma and Cunningham that has some similarities:
- Cut Song: When allegations of plagiarism for the "Metal Gear Solid Main Theme" began to surface during the game's production, the game's theme song, "Show Time," which originally included the "Metal Gear Solid Main Theme", was re-edited so that it didn't. Sadly, this was not a temporary change, and the song has never surfaced again, even in the 20th anniversary soundtrack collection (also, this is the only game with Metal Gear Solid in the title that doesn't have Metal Gear Solid's game over music at all, including Ghost Babel, but this is generally viewed as less significant by fans).
- Mid-Development Genre Shift: Portable Ops originally began development as a competitive multiplayer shooter similar to the online multiplayer mode in Metal Gear Solid 3: Subsistence before it was made into a story-based Metal Gear Solid game.
- The Other Darrin: The CIA Director was "voiced" by Paul Collins in Metal Gear Solid 3 and voiced by Jesse Corti here. Somewhat justified, though, as while Collins might have voiced the CIA Director, he didn't actually have any lines, as he only had a minor grunt of disgust when Naked Snake refused to shake his hand.
- Recycled Script: Grab Metal Gear Solid. Replace Solid Snake with Naked Snake, Liquid Snake with Gene, FOXHOUND with FOX, Deepthroat with Ghost, and some other changes and you'll get the script of Portable Ops.
Trivia / Metal Gear Solid: Portable Ops