Halloween 2: The Ghost of Hetty's Past - S2-E5
Stupidity: If Sam was so worried about conserving oxygen, she should have blown out the candles in The Vault.
Stupidity: When Trevor died, he saw himself on the floor therefore he was aware of what happened to him, but he was shocked to learn that his body was originally dumped in the lake by his friends.
Suggested correction: After Trevor died, the other ghosts took him to another room to explain to him what was happening, only Sasappis saw what happened to Trevor's Body, and he kept it a secret to protect Trevor's image of his "bros."