Continuity: Indy and a soldier fall down on the tank, right where some bags are. From the next angle they are half a meter before the place where the bags are.

Revealing: When fire sweeps through the catacombs under the church, you can see that the "rats" are completely fake. At the far left of the screen (widescreen) you can see several fake rats just hanging on the wall and not moving at all. In the "special features" section on the DVD, Steven Spielberg admitted that the rats were fake - he couldn't bring himself to roast live ones so he could not make this scene appear realistic.

Continuity: When the military caravan with Brody is driving through the canyon towards the Joneses and Sallah, the sun is behind Brody (discernable by the shade). But when Indy is looking down on them - from the front - the sun is also behind him.

Continuity: Indy falls off the side of the tank and gets his shoulder strap caught on the gun - this should not be possible because his shoulder strap is underneath his jacket, as can be seen when he gets back up onto the tank.

Continuity: As Indy swings through the window to rescue his father, he gets hit on the head by a vase. His hat is all crumpled and tipped quite far back, then in the very next shot his hat is neat and level.

Audio problem: In the boat fight scene, Kasim says something like "If you don't let me go, we both die" and Indy shouts "Then we'll die." But if you look at his lips, he's saying something else.

Plot hole: After the "Protectors of the Grail" set the petrol alight to kill Indy and Elsa, they must have thought that they couldn't survive it. Yet they then run out of the library fast and look around to find them, as though they expected them to escape.

Continuity: When Indy and Elsa are wading in the petroleum looking for the knight's tomb, Elsa unbuttons and opens her jacket and starts to take it off. In the next shot she opens her jacket and takes it off again.

Revealing: In the scene where Indy is being chased on the motorboard the guy behind tries to shoot him with a machine gun. If you watch the machine gun carefully it you will see it starts to disintegrate in the guy's hands and the barrel drops off.

Visible crew/equipment: After Elsa gives Donavan the false Grail, he turns and you can see the reflection of the camera lens in the cup.

Continuity: In the speedboat scene where Dr Schneider rescues Indy and Kasim from the boat that is chopped up by the propeller of a ship, she driving the speedboat with the steering wheel on the right-hand side. Seconds later as she drives the speedboat away,the steering wheel is on the left-hand side, obviously a flipped shot. When the speedboat slows down to allow Kasim to alight at the jetty, Indy is at the wheel which is now back on the right-hand side.

Continuity: In the beginning, when Indy is fighting aboard the Coronado ship, the very first time we see Indy in this scene (before we see him get punched), he is bleeding from the right side of his mouth. Throughout the remainder of the scene, he is bleeding from the left side of his mouth.

Continuity: In the temple in the Canyon of the Crescent Moon, Indiana Jones rushes to his father's aid with the Holy Grail filled with water. He is shown pouring every last drop onto his father's wound by turning the Grail upside down, yet another camera angle shows his father clutching the grail to his chest, and there's still a bit of water in it.

Continuity: In the catacombs underneath the library, when he find the "X" on the wall, he is shown ramming the wall twice to break through. The first time he rams it, however, the wall looks as if he had already had a few goes already.

Continuity: When Indy takes four horses before battling with the tank, three are black and one is bay (brown with black legs, mane and tail). Sallah is riding a chestnut. When they ride to the Grail Temple, there are two black horses and two chestnuts. Where did the second chestnut come from?

Continuity: When young Indy (River Phoenix) is advised by the fedora-topped henchman at the end of the chase, the cut he received while using the bullwhip in a previous scene changes angles.

Continuity: When Indy and Elsa escape underwater, and surface from the tunnel, Indy's suit should be drenched, but it only has water stains. Then during the speedboat chase, their clothes are completely dry.

Audio problem: When Indiana is fighting one of the bad guys on top of the rhino's car on the train, the rhino sticks his horn straight between Indy's legs. Indy says, "Holy smokes" but if you look, he actually says something else.

Continuity: When the Nazi is strangling Indy with the chain, Indy looks down into the porthole of the tank and yells, "Dad!" Before he throws the gun down into the tank Indy's hat comes loose, but when the next shot is back on Indy, and he yells, "Dad! Dad, get out!" now his hat is back to normal.

Continuity: In the boat chase, when the bad guys are using machine guns, in one shot we see Indy's boat in the middle of the canal. In the next shot (close-up) they are very close to a large pile of dirt (or wood chips) and in the next (wide) shot they are in the middle of the canal again.