- Acting for Two: Jemaine Clement as both 2012 Boris and 1969 Boris.
- Actor Leaves, Character Dies: Combined with Role-Ending Misdemeanor. Zed was killed off because Rip Torn had been arrested for drunk driving. And broke into a bank with a loaded firearm. So, more like Role Ending Felony.
- Billing Displacement: Although Tommy Lee Jones gets second billing, he's only on screen for 15 minutes. Josh Brolin portrays the younger version of Jones' character and has much more screen time, but gets billed third.
- Creator Couple: Jada Pinkett is one of the 1969 Factory party guests.
- Dawson Casting: K is supposed to be 29 in 1969. He's played by Josh Brolin, who was 43 during the filming. J lampshades this, looking incredulously at K and snarking "Got some city miles on ya, huh?"
- Fake Brit: In the third film, Boris the Animal is played by the New Zealand actor Jemaine Clement. He's technically an alien, but he speaks with a British accent reminiscent of Tim Curry.
- Hypothetical Casting: Will Smith suggested that his son Jaden Smith should play the colonel's son, but Barry Sonnenfeld disagreed, giving the role to Cayen Martin instead.
- Missing Trailer Scene:
- The first trailer features a scene where J and K ambush an alien named Marco who takes the form of an animated graffiti snake on a building wall, which doesn't happen in the film.
- Jeffrey Price also mentions that has a 24-hour window to finish his mission. In the final cut, this is changed to Jeffrey simply telling J not to lose the time travel device.
- The Other Darrin:
- In the Japanese dub, Takashi Taniguchi voices K (and his younger self) instead of Yoshisada Sakaguchi.
- In the European French dub, Samuel Labarthe replaced Claude Giraud as older K. Giraud had retired prior to the film.
- Real-Life Relative: Barry Sonnenfeld's daughter Chloe appears as the hippie girl who meets 1969 Boris at Coney Island.
- Role Reprise: Will Smith and Tommy Lee Jones reprise their roles from the first two films.
- Separated-at-Birth Casting: Josh Brolin is a remarkably good young Tommy Lee Jones.
- Sequel Gap: It was released ten years after Men in Black II.
- Throw It In!: The Funny Background Event by one of the guards when J, K and Griffin are talking to the colonel.
- Underage Casting: An implied example: Alice Eve, who played the younger O, was in her late 20s during filming. The character is probably around the same age as her actor, meaning she would be in her early 70s by 2012. Emma Thompson, who played the older O, was 51 whilst filming, and would have been just 10 years old at the time Alice Eve would be playing her younger self.
- What Could Have Been:
- Mark Wahlberg was almost cast as the young K.
- Production delays forced Alec Baldwin to drop out of the film. Alec was the original choice to play Chief X, the head of the Men In Black agency in the sixties.
- Sacha Baron Cohen was considered for the role of Boris The Animal.
- Gemma Arterton was originally cast as young Agent O, but scheduling conflicts prevented Arterton from taking the role.
- Word of God: According to an interview with director Barry Sonnenfeld, Frank is the talking pug advertised on a carnival poster in 1969.
- Writing by the Seat of Your Pants: Filming began without a completed script, which led to a delay in production, so the screenplay could be rewritten and completed.
- You Look Familiar: The woman who lives in K's apartment in an alternate timeline is the same woman in Men in Black II whom Patrick Warburton is told to marry and have a bunch of kids.
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