When Robin sits with the sword of Albion in Sherwood in the beginning of the episode the pummel on the sword is askew. Usually it aligns with the edge and the cross-guard, but here it sits in the opposite direction.
When the Hounds of Hell ride into the village of Wickham, a close-up of the rams' horn crest on the horses' headgear reveals rubbery wobbling of the horns; the motion can only be explained by the horns being of an unnatural material like rubber. They are clearly not actual rams' horns.