Hallucinations don't really work that way. They happen when you ask an LLM to generate new material. Not so much reviewing existing material.
But there's always the "ask a second LLM to get two opinions" technique which gets you pretty close to error free.
And... now that I think of it... even if it was terrible and missed 50% of the errors... wouldn't that still be better than using no LLM which catches 0% of the errors?