Yeah that's always been a fear but I always dog food and I've had no issues yet

ive done it with transforming data (for example pasting a table in and asking it to turn it into LaTeX) or something and had the occasional issue with it misordering or forgetting things. It didn't take long to spot the error for me though

You could run it through thrice with a different prompt/temperature/model and pick the majority result (or exit with success on the first two passing runs).

Good idea. If the data is a list of records where the order isn't important, randomly permuting them (ETA: then sorting the final outputs) would be another option.

ETA2: Would the downvoter care to explain why? Genuinely puzzled.