Do science fiction films need to have realistic science?

[philmophlegm]

“An American physicist is calling for Hollywood producers to tone down the fanciful science in movies - and restrict themselves to just one scientific flaw per film.”

http://news.bbc.co.uk/1/hi/magazine/8530405.stm

So – how real should the science in science fiction be?

Discuss.

Personally, as long as the fictional setting is internally consistent, I’m not overly bothered by fanciful ‘science’ in science fiction. I think science fiction should be more about the fiction than the science.