Final answer:
The narrator finds the child's corrupted language and her own unreliable narration due to mental illness as strange elements in the stories.
Step-by-step explanation:
One strange thing the narrator is aware of in the short stories mentioned is a child's growing awareness and attempt to replicate language, as seen in the nonsensical song with the line 'O, the green wothe botheth.' This is considered strange as it represents a corruption of language, reflecting the child's learning process. Another strange situation is the unreliable narration of a character in another story, suggesting confinement in a child’s playroom, which contrasts with the possible real function of the room, indicated by the bars on the windows. This is strange because it reveals the narrator's misinterpretation due to mental illness, leading to a distorted perception of reality.