The Bermuda Triangle Crisis - S2-E4
Revealing mistake: When Wonder Woman drops a mine into the water, she's supposed to be dropping it into the ocean. However, you can see a drain plug of some sort in the background and the "ocean" is obviously a pool, or similar.
Brain Wash - S3-E8
Continuity mistake: As hairdresser Bob is washing Jamie's hair in the sink, the shampoo coverage changes between shots. During the closeups, he never touches her forehead and ears but in the wide shots, her head is completely doused.