Board Thread:General Discussion/@comment-5821891-20131031221624/@comment-4839682-20140324005513

Time travel is clearly possible, although we don't know much about it.

Jefferson got the apple from the past. He specifically told Regina to remember the time and place where the apple was, so she thought to that moment, not just to the place the apple was.

Rumple mentions "time and space" in "The Return", when he thinks August Booth is Baelfire. I believe it's literally "You traveled through time and space".