Event Horizon

(at around 5 mins) The shot where Sir Sam Neill stares out of a window which then pulls back to reveal he's on the deck of a space station orbiting Earth took the digital special effects house Cinesite 10 weeks to achieve. The shot lasts for 45 seconds and took nearly a third of the film's visual effects budget, because it was filmed using separate scale models of different size that had to match up perfectly. Director Paul W.S. Anderson said that the shot had to be re-done over 20 times before he was satisfied with it, and half-jokingly claimed that the man working on it had to take a year-long sabbatical afterwards to recuperate.

(at around 53 mins) When Justin is ejected into outer space, his veins immediately start to burst and bleed heavily. This isn't very likely to happen in the short time that he is exposed to the vacuum of space. Parts of the body will probably start to bulge due to the lack of atmospheric pressure, and there will probably be some subcutaneous bleeding from ruptured blood vessels, but the human skin is thought to be resilient enough to stay intact. Also, the blood that leaves his body remains liquid; in reality, it would boil and evaporate instantly due to the lack of pressure. Not everything about the scene is unrealistic: the fact that he remained conscious is probably correct (most adults would remain conscious for 10-20 seconds), as well as the fact that he does not freeze (although deep space is extremely cold, the lack of gas molecules makes it difficult for body heat to leave the body).

The opening credits are sucked into a black hole. The screen viewpoint pans upward, above, and over the regular Paramount mountain before the opening credits, which usually remains stationary and then fades out.

Two versions were produced, the theatrical release and a "rough cut." Runtimes were, respectively, "1h 36m (96 min)" and "2h 10m (130 min) (rough cut)".