Also unsurprisingly, the fourth movie is very popular among the Karen Rebels in Burma. The film's catch phrase "Live for nothing or die for something" has actually become a rallying cry for the rebels.
The Character Died with Him: Trautman died off screen in the fourth movie because Sylvester Stallone felt it wouldn't feel right replacing the late Richard Crenna. As he himself put it: "Trautman died the day my friend Richard died."
Divorced Installment: For the Rambo Master System game, Sega's license was only applicable for the American version, so when it ended up being released in Japan and Europe, it was relabeled Ashura and Secret Commando respectively, with all use of Rambo imagery and theme music taken out.
Fake Russian: Both Podovsky and Zaysen were played by an Englishman (Steven Berkoff) and a French (Marc de Jonge), respectively.
Orlov was demoted to a lieutenant colonel and assumed a new identity.
Mean Character, Nice Actor: Maung Maung Khin, who played the bloodthirsty Burmese Major Pa Tee Tint in Rambo 4, was actually worried that his family would be murdered if he took the part.
Name's the Same: Part II has Marshall Murdock. The film was made at the same time a famous tv-show also about the Vietnam war was running that also had a character named Murdock; the writers probably named Marshall Murdock after him. In addition, Charles Napier, who played the Marshall in Rambo, even appeared on The A-Team twice.
Dustin Hoffman was the first choice for John Rambo with Mike Nichols directing. He turned down the role because he felt the script was too violent. Actually, just about every Hollywood A-lister was considered for the role at one time or another (it was in Development Hell for years). And Kirk Douglas was attached to direct at one point.
Kirk Douglas was actually cast as Colonel Trautman for a little while, but he walked off the set and Richard Crenna was called in to replace him due to disagreements with the director and producers over the film's ending. The DVD extras of First Blood contain marketing stills of Kirk Douglas wearing Trautman's signature uniform.
Sylvester Stallone was working on a script for a fifth Rambo movie, which would have featured the titular hero going into Mexico to rescue a teenage girl who had been kidnapped by the northern drug cartels. But after the success of The Expendables the project was scrapped so that Stallone could focus on the sequels for that franchise.
In Japan, where Rambo was indeed very popular, the word "rambo" can be translated as "senseless violence"
Likewise, in Finland, "Rambo" has become a generic word to describe a commando of any sort. So much so that many younger people are surprised to find out the word comes from the movies instead of the other way around.
In Taiwan, any knife with a serrated blade back has come to be called a "Rambo Knife".
Rambo is in fact named after a US Postal Service worker, who also went on to cultivate a type of apple that now bears his name.
His first name comes from the war song "When Johnny Comes Marching Home Again".
Warhammer 40K has a homage to Rambo in the form of a special character for the Imperial Guard. His name? 'Sly Marbo'.