Easy for You to Sleigh/Whishy Washy/Who's to Flame - S1-E4
Continuity mistake: Easy for You to Sleigh: When Lifty and Shifty are watching Mime in his tent, Mime leaves the room and turns off the lights using the light switch. Then, when Lifty and Shifty are inside the tent, the light switch has changed to the on position despite the lights still being off. (00:03:29)