asked by Anonymous: "It seems to me there was no "first time" RE:Future Simon. It's a closed causality loop, he always went back and things always worked out like that. To use an example, in the first Terminator movie John Conner is only born because Skynet sends someone back to kill him (or actually his mum) - if they hadn't tried to kill him he'd never been born (which means they had to try to kill him the very first time or he wouldn't have been born to bother them). It will always work out the same-in a closed causality loop time can't be altered, the time travel/"changes" were always part of the timeline.
Open causality loop is when you can make changes and history rewrites itself as a result.