Murder Ain't What It Used to Be! - S1-E7
Revealing mistake: Jeannie is not supposed to see Marty at all, but when she is in her flat and she is getting up off her sofa, she is seen walking around him, as if she can see him.
Continuity mistake: When Floris and Sindala ride out the gate by surprise, the cook's position (he was opening and closing the castle gate to let them through) is different when the camera changes.