Sigourney Weaver, Alien20th Century Fox

Most solid sci-fi movies include one of three core elements: monsters, robots, or the future. In Guillermo Del Toro's "Pacific Rim," which hits theaters this week, you get all three.

Del Toro's new film is the perfect sci-fi amalgamation -- it's giant monsters fighting giant robots on a ruined planet. Unfortunately, things in the science fiction world aren't always perfect. After all, technology has a habit of breaking down from time to time.

Therefore, we've rounded up a few of the top movie mistakes from some of your favorite sci-fi flicks, from Darth Vader's costume malfunction in "Star Wars" to Stanley Kubrick's accidental cameo in "2001." You can check them all out below.

Once again, a big thanks to for providing us with the photos.

Del Toro Resurrects Monster Movie With 'Pacific Rim'

categories Features, Movies, Sci-Fi