Welcome to FT, notsofrequentflyeryet!
There is no magical trick to finding error fares, just stop by frequently, and sooner or later your timing will be right. The most important thing, though (which has already been pointed out by wanaflyforless) is that there's so much more to FT and travel than finding mistakes.
I'll move this thread to the MR discussion forum.
--jpdx, MR Moderator