The Girl Who Was Death - S1-E15
Audio problem: For some reason, "Londonderry Air" was dubbed over the original song being performed by the actors/singers. Their lips aren't moving in sync with the words at all.
Audio problem: After Colonel White thanks Captain Scarlet and Captain Blue at the start of the episodes, they reply with each other's voices.
The Spores - S2-E7
Audio problem: When the flower delivery van flies off the asphalt road and into the dirt, a tires-screeching-on-asphalt sound is heard as it hits the dirt before rolling over.