Originally Posted by Big D
I reckon it could be argued to follow either. On the surface, it doesn't appear to flatly contradict the show or the movie in any overt way. In both versions of the continuity, Sarah's either dead or in danger of dying. In both, she's done her best to forewarn and forearm John against the future.
I've read ever since the movie started that it does not follow the TV show and it clearly doesn't. In the TV show JD takes place in 2012 and John skips ten years of his life, traveling from 1997 to 2007. It's all so jumbled up that there's no way T4 follows it. It only follows T3.