Other mistake: As they track Zoref, Victor calls for a view of Corridor 16, then after viewing it, calls for Corridor 49. In both views, it is the same Corridor, as evidenced by the number 16 on the lighted wall panel on the corner facing the camera.
Mystery of the Fearsome 100 Demon Empire - S1-E2
Other mistake: When Joho is looking at 'the crazy guy' praying under the dam, the racquets in his hand (assuming that's what it is) are misshapen. (00:10:15)
Other mistake: At the end of this episode when Jonathan and Nicky set off on horseback to the canal to board the tug boat "Heartsease" they leave late at night and arrive the next day. But in episodes 7 and 8 Margaret rides on horseback to Heartsease and home again, and the journey only takes a few minutes.