Revealing mistake: In practically all the episodes, where we see Darken Rahl wearing a sleeveless shirt, there are visible vaccination scars on his shoulders.
Legend of the Seeker (2008)
1 revealing mistake in Season 1 generally - chronological order
Starring: Bruce Spence, Craig Horner, Bridget Regan, Craig Parker
Continuity mistake: Season: 1, episode: 16 "Bloodline". As two soldiers of Darken Rahl approach the plains of Morrow, they break a magical shield which catches them on fire. Two frightened soldiers run away, and the commander shoots one. Keep an eye on the commander - he is still pointing the crossbow even after the soldier dies. The next shot, however, has his crossbow loaded with another arrow, daring anyone else to run away.
Zeddicus Zul Zorrander: Wizard's second rule: The greatest harm can come from the best intentions.