King Ottokar's Sceptre: Part 2 - S2-E5
Continuity mistake: The piece of wood the detectives throw at the window has a straight Y shape. In shots of the wood on the ground, the Y is much more outstretched compared to other shots. (00:34:50)
Continuity mistake: Tony Sparkle is seen defacing a picture of Judy Talent. He starts writing something beginning with T. The action cuts away for a moment, and then back again. The words on the picture are "SAD OLD BAT". (00:07:05)