I can forgive the modeling being godawful jank (windows floating in the air, disconnected from the house). But I expected it to have a better understanding of the text. Instead, we have Bilbo's "disappearance" interpreted as him magically transporting or cloaking, and similarly for his reappearance.
But this only seems wrong to you because you're familiar with the prior context. When there's only a single paragraph to work from, and it's a drily humorous text, why not employ comic literalism and lean into the perplexity with which his neighbors viewed him?
The LLM has access to the full text and every translation of it ever produced, both in its corpus and on the searchable web.
The fact that a ring appears at the end proves that the model has context beyond what was in the prompt. The model clearly knows the story that the prompt was extracted from.
This is a rationalization. The simpler explanation is that the model failed to properly depict the passage. As the AI booster crowd would say, cope.
which to be fair, happens just a few paragraphs later :) I first watched without sound and thought "oh that's the birthday speech disappearance"