Corrected entry: When Indy is desperately trying to rescue his father during the desert tank chase, he successfully explodes one of the tank's cannon barrels, but then becomes (impossibly) entangled on the exploded barrel by his bag strap. Indy even dangles his entire weight from the strap for a couple of shots. For the Indiana Jones films, Indy's bag is and always has been a government-issue gas mask bag, made of raw canvas with decidedly weak cotton seam stitching (the gas mask bags were never expected to last more than a few years in service). For the movies, the bag's actual canvas web strap was replaced with a 60" length of seasoned and durable bridle leather (which can easily support the full weight of an adult human). The problem is not the strength of the leather strap; rather, the problem is the strength of the canvas bag stitching. The bag's strap attachments were never designed or fabricated to support full body weight, so the bag stitching should have ripped out immediately (and fatally) when Indy dangled from the cannon barrel.
Corrected entry: In the tank scene, a German fires a bullet which hits the tank driver and he falls on to the controls, turning the tank. As almost everyone in the tank is dead/unconscious nobody would move the body so the tank should go round in circles.
Corrected entry: In the motorbike chase after the rescue of Indy's dad from the castle, you can see how they pass the border between Austria and Germany. The guardhouse is waving the Austrian flag. Austria however ceased to exist as a sovereign state after the annexation by Germany in March 1938. Looking at the weather it rather seems to be spring than winter. Therefore there would no longer be a guard at the border nor a guard house waving the Austrian flag.
Corrected entry: When Indy and Elsa are back at the hotel after the boat accident, Elsa's room is wrecked. How did Indy not know she wrecked it herself or hear her wrecking it? He was only 2 doors down. He could hear the music playing in the bathroom but not her trashing her own room. He should have known she did it when she came out the bathroom surprised. Seriously, how can you be in the bathroom and not hear someone trashing your hotel room?
Corrected entry: When Indiana finally breaks through the giant 'X' on the library floor, he simply pops out the remaining marble in that area. In reality, the marble "tiles" would have been held together by some sort of cement joint, rendering it impossible for him to remove a neat square of marble without using some sort of cutting tool first. (00:29:55)
Corrected entry: In the library scene, the Grail Protectors hit Marcus in the head and drag him. What kind of spies/soldiers/agents are they if they didn't find the grail diary on Marcus's pocket? Surely the book would be interesting to them, since it contains lots of directions to find the grail...
Corrected entry: Once Indy gets past the blades, he stops them and shouts that he is through, once past the "Leap of Faith", he throws sand on the bridge to make it visible. But what about the "Word of God" device? Indy does not shout what to do, and as pointed out, Donovan & Elsa didn't know what else was in the book (about the final challenge). They didn't even know that the second device was called the "Word of God". Unless she took a wild guess that they had to spell Iehovah...