- For this film, Orlando Bloom gained 20 pounds.
- During the filming of the film, Orlando Bloom not only injured his hands, but also had a cold for one month.
- The crew built a total of 3 siege towers, each weighing 17 tons, and also produced 4 slings.
- There are about 800 special effects shots in the whole film.
- Edward Norton finished his filming in two weeks.
- The shipwreck scene in the film was completed with CG technology.
- Because King Baldwin wore a mask, Edward Norton, who played the king, asked that his name not appear in the cast.
- After the director's cut version of the film was completed, Fox boss Tom Rothman urged Scott to shorten the length of the film. In desperation, Scott had to follow suit. In the end, Rothman backfired. The film's US box office was less than $50 million, which was a complete failure compared to the high cost.
- During the shooting in Morocco, the shooting news was leaked. The Daily Telegraph published an article criticizing the prospect of the film, and the director Scott's bodyguards increased to four. In addition, the throwing arm of a sling was accidentally broken. Fortunately, no one was injured, and a siege tower accidentally caught fire.
Kingdom of Heaven behind the scenes gags
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Tiberias: There is a rumour. We must condemn it immediately.
Sybilla: Call it treason. And kill those who whisper it.
Tiberias: The rumour will die if we show the boy as active...
Sybilla: [bursts out] How long before he wears a mask? Will you have one made for him? How did my boy deserve it? Jerusalem is dead, Tiberias. No kingdom is worth my son alive in hell. I will go to hell instead.
[Tiberias steps forth and hugs Sibylla]
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Hospitaller: One may stare into the light, until one becomes the light. I've done it many times.
Balian of Ibelin: [throws a rock at a bush that catches fire by the spark] There's your religion. One spark, a creosote bush. There's your Moses. I did not hear it speak.
Hospitaller: That does not mean that there is no God. Do you love her?
Balian of Ibelin: Yes.
Hospitaller: The heart will mend. Your duty is to the people of the city. I go to pray.
Balian of Ibelin: For what?
Hospitaller: For the strength to endure what is to come.
Balian of Ibelin: And what is to come?
Hospitaller: The reckoning is to come for what was done one hundred years before. The Muslims will never forget. Nor should they.
[the Hospitaler slowly walks away as a second bush several yards from the burning one catches fire. The Hospitaler is nowhere to be seen in the clear and open desert]