Gravity Lens points us to the website Sci-Fi Science Blunders which lists scientific errors made in science fiction. It hasn’t been updated in a while (Bad Astronomy, however, is still being updated) but it’s still a decent site. I’m sure there are lots more infractions than are listed here.
Science blunders in science fiction, assuming you catch them, are potential story killers depending on the reader/viewer. A scientific fallacy might be easily dismissed or it might be the thing that stops you from reading/watching. Suspension of disbelief can be shattered if, say, a planet scan determines the surface temperature to be -280º C. Some people are annoyed with explosions in the vacuum of space. Whatever the reader’s willingness to let it slide, realistic science makes for good science fiction.