I think the fairy dust episode is "Dark Hallow." That's when the dwarfs have to open a vein in the mines to find fairy dust for Belle to pour the cloaking spell. It could also be "Child of the Moon," which is when they're digging for the diamonds to make fairy dust, and Grumpy eventually crashes through a cave wall and finds them.

The Charming/Snow episode sounds like "Lost Girl." They've been fighting because Snow wants to leave the kingdom but Charming doesn't, and Grumpy insinuates Charming might be a gold digger, since he's so concerned about keeping the kingdom.

Hope that helps! :D