Claudia and the Secret Passage - S1-E8
Stupidity: The fact that Kristy found the ring that was missing for 40 years just sitting on a windowsill in the secret passage makes no sense; Dawn and Claudia were just by that window earlier in the episode in broad daylight.
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Suggested correction: We don't actually see where Kristy found the ring; it was dark, and the girls were chaotic.
She picks it up from the windowsill but states it was in the insulation. Regardless, it was there in plain sight where she could find it in the darkened attic.