Indiana Jones and The Last Crusade (1989)

Plot hole: When Indy is stepping on the letters at the end, trying to spell out God's name, he steps on J, incorrectly, causing it to collapse. When he falls through, however, he grabs onto another letter so as not to fall down. The letters he grabs onto and pulls himself up are an L and a Y, which are not in the word Iehova, so should have collapsed too. (01:46:20)

Plot hole: At one point, Indy rolls off of the side of a tank, and somehow gets a strap around one of the guns pointing out from the sides. The end of the barrel has already been blown open by the rock he shoved in earlier. How did the strap get around that big cluster of metal, and then back again so he could climb back on the tank? (01:34:15 - 01:35:05)

Plot hole: After Indy discovers the knight's tomb, the men after him light the petroleum and Jones dives under the liquid with the paper he used to copy the knight's shield. How could that paper have made it through that scene without gaining damage?

Plot hole: When Donovan drinks from the false grail a full bunch of dark gray hair suddenly grows by his fringe. He is supposed to age, not to become younger.

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