Eeyore's Tale of the Missing Tail / Pooh, Light Up My Life - S1-E4
Continuity mistake: In "Eeyore's Tale Of The Missing Tail", Lumpy ties the rope and rock to Eeyore, but when the Super Sleuths come it is gone.
Pooh's Double Trouble / Eeyore Sleeps on It - S1-E19
Factual error: The letters and symbols on the characters' reflections in the mirror look like their regular counterparts, when they're supposed to be in reverse.