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Other mistake: When Kylo/Ben leaves the Endor system to go to Exogol, he takes an old Imperial TIE Fighter he supposedly found in the Death Star remains. However, it is established in the previous films that that TIE fighters are short range fighters that are not equipped with a hyperdrive.
Suggested correction: A TIE fighter would never survive the death star crash. Kylo/Ben probably called for a TIE and took that.
But it's an old Imperial TIE, not a new First Order one.
Jon Sandys ★
Good point.