In Looper (2012), Joe starts explaining time travel to Sara, and she says "You're a looper?" How did she know what a Looper was? What was her previous tie to the criminal world?
From a mere writing standpoint it could just have been a shortcut, so that Joe doesn't get a hard time explaining to her all the things she surely wouldn't believe, which wouldn't bring the story much further (Ok, maybe it could have opened other interresting conflicts and sub-stories, but well).
And in fact when he started "time travel is not possible, but in thirty years..." I found myself thinking nerved "Whoa man, stop it, she's never gonna buy that" only to be relieved when she said "You're a looper", thinking "thanks, not a hard long mistrustful explanation session".
I'm not saying that's the only reason (or that everybody would have felt like me and explaining it to her couldn't have been a good story arc, too) and there is no in-story explanation. But seeing that not everything in Looper was that thought out well, it's a possibility.
I read a fascinating review/article that mentioned in passing this plot point. I can't find it right now and I'll edit this post when I do. (AHA FOUND IT). The author of this review put forward a theory which blew my mind.
We see in the movie that not just "Loopers" and people sent to disappear are sent to the past. We saw that Abe was sent back from the future to hire Loopers and keep an eye on that end of things.
In the end Sara convinces Cid that she is his mother and it was her "sister" who was killed accidentally by his tantrum. What if Sara was sent from the future to the year 2044 so that Cid would have a stable childhood and not grow to become the Rainmaker?
Quote From the article (Which the writer/director Rian Johnson retweeted so probably thinks is an interesting theory if not what he was planning when writing it:)
From TV Tropes:
protected by TylerShads♦ Mar 28 at 17:21
This question is protected to prevent "thanks!", "me too!", or spam answers by new users. To answer it, you must have earned at least 10 reputation on this site.