Episode XX - Jack and the Monks - S2-E7
Revealing mistake: Immediately after the time portal is destroyed, it stops raining but there is no moisture anywhere.
Episode XXVI - Jack's Shoes - S2-E13
Continuity mistake: When Jack meets the old father, watch the platform thing he is on. The yellow/black pattern alternates on the right side.
Chosen answer: Gotta get back, back to the past...
Rlvlk