Goofs:
Continuity: The look of the legs does not correspond between the practical and computer-generated Aliens; the CG ones have an extra joint at the ankle, while the practical Alien shot by Vriess is shown with human looking ankles (i.e. without an extra joint) as it is seen crouched on the grate from below. Also, it lacks the long toes of the CG Aliens, instead having more human-like feet. (more)

Trivia:
Joss Whedon went through five different versions of the final battle with the "Newborn" creature, the first four versions of which all took place on Earth in such settings as a hospital maternity ward, a giant junkyard, a snowy forest and cliffside, and a desert. (more)

Filming Locations:
20th Century Fox Studios - 10201 Pico Blvd., Century City, Los Angeles, California, USA (more)

Quotes:
[first lines]
Ripley: [voiceover] My mommy always said there were no monsters. No real ones. But there are.
(more)

Awards:
4 wins & 14 nominations (more)