The swallow evaluation, or the documented reason one was not indicated. A recommendation for evaluation that was never acted on is close to indefensible.
The current diet order, including texture and liquid consistency, and every change to it, with dates. Diet orders change and the question is always whether the change reached the kitchen.
The tray ticket or meal record for the meal in question, and how the kitchen receives and confirms order changes. A verbal process is a documented weakness.
The care plan supervision level at meals: independent, supervision, set-up assistance, or full assistance, and the staffing that made it deliverable in the dining room at that hour.
Training records for dietary staff and caregivers on dysphagia, texture modification and choking response.
The emergency response: what was done, by whom, in what order, when emergency services were called, and whether suction equipment was present and functioning.