We don't know if they showed him the clue or not...all we really know is that they gave him the address and he mistyped it into his GPS.Jeff and Jordan should have shown the driver the clue. Their cab driver would have known where to go if they had done that. I don't know why anyone would leave the the sauerkraut challenge. It was very easy.
And I couldn't have done the sauerkraut challenge (and I love sauerkraut, but I couldn't have eaten it that fast).