According to director Paul Verhoeven in the film commentary, the famous "Get your ass to Mars" line was actually an afterthought to bridge the film's change of setting from Earth to Mars. Originally Verhoeven wanted to film a separate scene showing Quaid boarding the shuttle bound for Mars, but could not do so due to budget constraints. As a compromise, Verhoeven came up with the idea of having the laptop device repeat the part of Hauser's message with "Get your ass to Mars" in a loop as the film transitions from Earth to Mars. See more

Goofs

The two moons of Mars appear in several background shots, but they are incorrectly depicted. They are both shown as being much larger than they would appear in real life - Phobos would appear to be about a third of the size of the Earth's moon, and Deimos as little larger than a star. In addition, Phobos orbits Mars faster than Mars rotates, so it would appear to rise in the west and set in the east, and should have moved visibly with respect to Deimos even from one shot to the next. The two moons are always shown in the same relative positions, however. See more