* ButIPlayOneOnTV: Morgan Freeman reported that during a press conference for the movie, many of the reporters called him "Mr. President".
* DuelingMovies: Set against ''Film/{{Armageddon}}'', a considerably more action-packed movie with nearly twice the budget. They were released the same summer, and both did well at the box office, probably because they took such different approaches to the material that they barely qualified as "dueling". The President's speech originally included the line "There will be no Armageddeon," but it was taken out as test audiences laughed during the line.
* HeyItsThatGuy:
** [[Film/TheLordOfTheRings Frodo]] and JoanOfArc got married!
** MorganFreeman is the President and [[Film/{{Babe}} Farmer Hockett]] resigned from being Secretary of the Treasury!
** [[Series/TheWestWing Toby Ziegler]] is [[Film/LordOfTheRings Frodo]]'s dad.
** [[Series/That70sShow Red Foreman]] works for NASA now.
** [[Film/GoneInSixtySeconds1974 Otto]] was the last man to walk on the moon.
** [[Film/IronMan2 Happy Hogan]] was sent drifting into space to die.
*** So was [[Series/AgentsOfShield Andrew Gardner.]]
** [[FunWithDickandJane Jane]] bluffed her way into an anchor spot even though she had no clue what "Ellie" really meant.
** Dantalian from ''Series/{{Charmed}}'' works at MSNBC.
** [[Series/DarkAngel Herbal]] makes an appearance at some point.
** [[Series/StarTrekTheNextGeneration Tasha Yar]] seems to have a tendency for being offed by malevolent bodies of liquid.
** Leo's science teacher once hosted ''Series/NickelodeonGuts''.
* ScienceMarchesOn: When the film was made, scientists believed that a large tsunami would suck back the ocean water, thus briefly looking like an unusually ''low'' tide, before the cresting wave crashed over everything. This is shown in the movie when Tea Leoni is killed. However, at the time the movie was made, an actual tsunami had never been filmed. The 2004 Indian Ocean tsunami, which was filmed, showed that no such sudden retreat of water is observed. Instead there is a steady inrush of water, which looks more like the old name for a tsunami--"tidal wave".
* ThrowItIn: The scene at the assembly were the kid tells Leo that now that he's famous, he'll get lots of sex, was improvised by the actor.
** MorganFreeman choose to roll up his sleeves during on of his speeches. The director kept it in because she thought it gave him an "everyman" look.
* UnintentionalPeriodPiece: In the early days of the popular Internet. Suffice to say the proliferation of powerful computers, Internet capabilities and personal smartphones tied to social media would make a very different event.
* WhatCouldHaveBeen:
** Producer Creator/StevenSpielberg expressed interest in directing early on.
** The shooting script was 188 pages, and in filmmaking, the rule is that each page represents one minute of screen time. The finished film is two hours. Yes, a ''full third of the film'' ended up on the cutting room floor, mostly character scenes such as Leo visiting the White House and the ''Messiah'' crew drinking vodka once they accept their fates. Quite a few scenes are evidenced in the trailers.
** The script also called for appearances from real-world personalities such as [[Series/RealTimeWithBillMaher Bill Maher]] and Creator/DavidLetterman, showing more of how the world would react to an impending comet impact.
* Filming the highway scene was a rather brilliantly handled puzzle. Each truck you see in the scene actually held bathrooms or a food stand. A radio transmitter was brought in and all the cars were told to tune into a specific station for direction - that's how everyone was coordinated.
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