The Locket was pretty standart stand alone episode of Season 2. Quite decent in writing/acting mostly. Drama was effective and not forced. Unfortunetely reset button at the end ruins it and makes this episode all too much "stand alone" without any after effects...I mean this could be easily "Clues" episode of Star Trek TNG and if you rip off another episode of another series so blantly it means you are in trouble in creative department.
I wouldn't say it had no consequences. Old Man Crichton popped up again Season 3.
Ah, but it did something much more important than that, something that's possibly connected to RoJoHen's point...
It was the first mention of Unrealized Realities.
Granted, they called them Centre Halos, but the concept is the same. It also thereby demonstrates how both Zhaan and Stark might have played into the larger developing arc had they stayed around.