The character of Kirk Lazarus was originally written as Irish. It was changed to Australian when Robert Downey, Jr. said it would be easier for him to improvise in the Australian accent he had already developed for Natural Born Killers (1994).
In the film, Kirk Lazarus says "I don't drop character 'til I've done the DVD commentary." When recording the audio commentary for the unrated DVD and blu-ray, Robert Downey, Jr. actually spends the entire commentary in the character that appears on the screen as the movie progresses.
Ben Stiller says that nearly all aspects of the Les Grossman character were developed by Tom Cruise, including the dancing and the look of the makeup. Stiller said that in addition to the more obvious makeup effects applied to Cruise's face and head, and the extra hair on his chest and arms, Cruise also decided to play the character wearing oversized prosthetic hands.
Robert Downey, Jr. was very reluctant to take the role because he felt wearing make-up to look African-American was offensive. Downey accepted the role because he liked the script and wanted to work with Ben Stiller and Jack Black.
For the fake trailer, "Satan's Alley", Tobey Maguire came in at the very last minute to film the role of Robert Downey, Jr.'s monk lover. He did it as a personal favor for Ben Stiller and Wonder Boys (2000) co-star Downey.
The South Asian gang Flaming Dragon, led by a pre-teen boy, is modeled after God's Army, a guerrilla army in Myanmar. The group was led by twin brothers Johnny and Luther Htoo, who were nine years old when it was founded in 1997. Johnny and Luther were fond of American action movie heroes, especially Rambo.
Ben Stiller first came up with the idea for this film while working on Empire of the Sun (1987). He has said in interviews, that at the time he had friends who were actors in Platoon (1986), and Hamburger Hill (1987), and they would go on about the intense "boot camp" preparation, and simulation of war these projects involved, and how it made them feel like real soldiers. Stiller found this funny, because he thought that being an actor in a war film, was nothing like being a real soldier in a real war.
The title is a play on "Tropic Lightning", the nickname of the 25th Infantry Division which has seen action in World War II, Korea, Vietnam, Southwest Asia, and Iraq (among others). The division was the subject of The Thin Red Line (1998) and Platoon (1986). Famous members include Oliver Stone, rapper Ice-T, and Track Palin, Sarah Palin's eldest son.
Several disability advocacy groups criticized the "Simple Jack" subplot, a movie-within-a-movie in which Ben Stiller's character portrays a mentally disabled man. The film includes clips of the fictitious movie and re-enactments by Stiller. Scenes between Robert Downey, Jr. and Stiller drew particular scorn for their repeated use of the word "retard". Producers took down a "Simple Jack" website, and proposed altering the movie in response to a special early screening for the disability groups in question, but did not change the film. According to co-writer Etan Cohen, the scenes were meant the satirize emotionally exploitative depictions of mental disability in movies such as Rain Man (1988), Forrest Gump (1994), I Am Sam (2001), and Radio (2003), and the actors who take these roles.
Although all the trailers seen in the film are for fake movies, there is one bit of real-life factual information. In the trailer for Satan's Alley, Tobey Maguire is credited as an MTV Movie Awards Best Kiss winner, which he actually won for Spider-Man (2002).
Many have speculated that Tom Cruise based his performance as a vulgar movie mogul on Sumner Redstone. He and Cruise had a public falling out after Redstone had Paramount Pictures terminate their development deal with Cruise. His physical appearance is more than likely based on Tropic Thunder (2008) producer Stuart Cornfeld.
Originally Nick Nolte's reveal during the video teleconference scene was intended to be an homage to Robert Shaw's character of Quint in Jaws (1975). Ben Stiller toned it down because he felt there were too many homages in the film at that point.
Various characters mention that Kirk Lazurus is a five-time Academy Award winner. As of the film's release, Katharine Hepburn holds the record for most acting Oscars ever won, with four. No real actor, or actress, has ever won five.
In one of the special features on the director's cut DVD, Ben Stiller said he has been developing ideas for this movie for about eight to ten years. One of his first ideas was that the movie was going to be about actors going to a "fake boot camp" for a couple of weeks and coming back with P.T.S.D. When Stiller started out in Hollywood, he had a lot of colleagues going into war movies and they would attend a "fake boot camp" in order to prepare for their roles. He found it ridiculous, and this was an early inspiration on what would become Tropic Thunder (2008).
It took fifteen takes to get Steve Coogan's nose to bleed during the video conference scene with Tom Cruise's character. Each actor's part was filmed separately, with Justin Theroux serving as Cruise's stand-in during Coogan's filming.
During the battle scene near the start of the "film within the film", Jeff Portnoy (Jack Black), yells, "You call in that snake and nape and get us some boom-boom NOW!" Used extensively by American forces during the Vietnam era, "snake and nape" was a close air support ordnance made up of 250-pound MK-81 "Snake-Eye" bombs, and 500-pound M-47 napalm canisters. Essentially, Jeff Portnoy's character "Fats" was telling the radio operator to call for airplanes to come in and drop a combination of conventional bombs and napalm on the enemy, so the wounded could be evacuated.
The poster for "The Fatties" behind Jeff Portnoy (Jack Black) in the trailer features the names of a few of the film's actual crew members: costume designer Marlene Stewart, editor Greg Hayden, director of photography John Toll, and screenwriter Justin Theroux. In addition, the poster contains the DreamWorks Pictures logo, the Dolby Stereo logo, and a fictional composite of several MPAA ratings (reading "PG - Parental Guidance - under 11 requires accompanying parent or guardian").
Whereas for this film, Ben Stiller planned to play a secondary character, but ended up playing the main character. The situation was the opposite for another film he directed, The Cable Guy (1997), in which Stiller planned to play the main character, but ended up playing a secondary character.
In the "never go full retard" scene, Kirk cites Peter Sellers performance in Being There (1979) as a good example of how to avoid missing out on an Oscar by going "full retard", as opposed to Sean Penn in I Am Sam (2001). In reality, Sellers was only nominated for Being There, just like Penn for I Am Sam.
In the "never go full retard" conversation, Lazarus notes that Sean Penn "went home empty handed" for "I Am Sam." The year of the Academy Awards where "Tropic Thunder" was eligible for nominations (and Robert Downey, Jr. received a Best Supporting Actor nomination for "Tropic Thunder") Sean Penn won the Best Actor Oscar for "Milk."
The medicine that used to darken Lazarus's skin, is actually a bottle of Chinese famos medicine that used to heal bone injury. The name of the medicine is Yulin Zhenggushui, which means a medical liquor that heals bones which is product from Yulin, Guangxi, China, same province as Guilin.
Christine Taylor: Ben Stiller's wife appears at the awards ceremony, sitting a few chairs in from the aisle. She'a briefly visible as the camera follows Tugg down the aisle. She also plays Simple Jack's mother in the 'Simple Jack' trailer.
The five actors nominated for Best Actor in a Leading Role are Tugg Speedman, Tom Hanks, Sean Penn, Tobey Maguire, and Jon Voight. Tom Hanks appears to have been nominated for playing a handicapped contestant in the Special Olympics, Jon Voight in a nineteenth century drama, Sean Penn as a blind man, and Tobey Maguire for "Satan's Alley."
Tug Speedman's celebration leap while holding his Oscar spoofs a similar antic by Cuba Gooding, Jr. after he won for Jerry Maguire (1996). Tug's leap can be seen on the television screen behind Les Grossman, when Grossman is talking to his assistant and telling him a monkey could do that job.
WILHELM SCREAM: During the three-helicopter raid at the beginning of the film, when an enemy soldier is hit by gunfire and is blown backwards (elapsed time 6:04). Also, when Tugg Speedman throws "Half-squat" into the river in the finale. When this throw is repeated in the end credits, the scream is heard again.
The book Rick Peck is skipping through when on the phone with Speedman is "The Little Book Of Big Breasts" - a collection of artistic photos of well-endowed women. It's not a movie prop, the book is real, commercially available in both full-size and (slightly abbreviated) pocket editions. (Many editions have a black bra covering the breasts on the front cover.)