Revealing mistake: In the arrow contest, as Robin was about to be assassinated, Blinkin grabs the arrow. If you look closely, as his arm reaches out, you see that Blinkin already has the arrow in his hand.
Continuity mistake: When Robin asks the villagers to "lend me your ears," they all take one of their ears and throw them at him. But in subsequent scenes, the villagers still have both of their ears.
Revealing mistake: When Blinkin falls out of the look-out post and crashes into the large tree, you can see it wobble.
Answer: Gibberish.
It means literally "I will send you to hell".