Revealing mistakes: When Holly brings the fossil of the lighter imprint to Rick, the imprint shows "BIG CAT" in reverse with the hinge nearest to the 'G' and 'T'. However, when the T-Rex steps on it compressing it, the letters are face up and the hinge on the opposite side of the lighter. If the negative was flipped the hinge would still be nearest the 'G' and 'T', but now it is nearer to the 'B' and 'C'.
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