- The film’s premiere day is the 21st birthday of the lead actor Liv Tyler. Liv Taylor had refused to appear in the film twice before, but she finally decided to act.
- Michael Bay played an aerospace scientist in the film.
- Bush Sr. suddenly visited the filming scene of the crew at Ellington Air Force Base.
- The crew was allowed to film the B-2 stealth bomber at Edwards Air Force Base.
- NASA allowed the film crew to enter the normally restricted area for shooting and use two spacesuits worth $10 million.
- When saying goodbye to Grace, Bruce Willis put her daughter's photo in front of her to brew a crying scene.
- The total value of equipment used by the cast and crew in the film is approximately $19 billion, including real oil rigs and space shuttles.
- Kevin Costner was expected to star in the film.
Armageddon behind the scenes gags
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Grace Stamper: Listen, Harry, A.J. is my choice - my choice and not yours.
Harry Stamper: He's the only one in your age bracket, Grace. It's not a choice, it's a lack of options.
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Oscar: Great, I got that "excited/scared" feeling. Like 98% excited, 2% scared. Or maybe it's more - It could be two - it could be 98% scared, 2% excited but that's what makes it so intense, it's so - confused. I can't really figure it out.
[to NASA tech strapping him in]
Oscar: Will you make mine really tight, 'cause I don't wanna fall out. I mean, almost to the point of cutting off circulation.