What happens if I flash back unexpected results with say a snapcaster Mage? If I hit a land does unexpected results return to my hand or be exiled?
It'd be Exiled. Part of the keyword ability for Flashback sets up a replacement effect to exile the card when it would leave the stack.
From the Comprehensive Rules:
702.32 "Flashback"....Flashback [cost] means You may cast this card from your graveyard by paying[cost] rather than paying its mana cost and If the flashback cost was paid, exile this card instead of putting it anywhere else any time it would leave the stack
RESOLVED
Cool thank you for the quick reply