Revealing: The biplane sequence is obviously filmed in a studio close up. Despite the fact that they are miles high and swooping around at high speeds, neither Indy's hat, nor his Father's, blow off or even flap in the wind.

Factual error: When Indiana's father uses the plane's gun, he shoots out the tail. This was not actually possible, as the planes had a safety mechanism to stop people doing this

Factual error: The evil SS officer is addressed as "Herr Oberst" (Colonel) throughout the movie. In the SS, however, this rank was called "Standartenfuehrer".

Continuity: When the tank is about to go over the cliff you can see that there is no one sticking out of it, but in the next shot, Vogel can be seen sticking out and yelling.

Continuity: In the scene where Old Dr. Jones is holding Young Dr. Jones while he is reaching for the grail, watch Indy's left hand. In the shot from above, it is by his side, in the shot from below, he is holding the rock. It keeps switching from his side to the rock.

Revealing: Ths stunt man who saves Senior from the tank has a perfectly trimmed beard and a thinner face than Sallah's.

Continuity: After Sr. says "Let it go" as Indy is trying to get the grail, Indy is swinging and not being supported by the wall. The next camera angle shows him grasping the wall near his head. Switched back to Sr.'s view, he is again not holding the wall.

Revealing: During the castle scene, when Indy is swinging outside, the sky is clear and blue and obviously not rainy, yet it is still raining. And yes, sometimes it can rain when it's sunny, but take a look - it is NOT rainy weather.

Continuity: When Elsa is looking out over the Canyon of the Crescent Moon, the sun is low - it is close to sunset. However when Indy is riding through the very narrow canyon, the sunlight reaches the bottom. It is not the same time of day (or later the same day).

Revealing: After the Nazi tank drives off of the cliff and hits the bottom, the upper turret breaks off. As the turret rolls over, you can see there is no hole in the bottom, just in the top.

Revealing: In the scene when Indy and Kasiem are fighting on the front of the boat, the front of the boat doesn't move at all when the huge propellor hits the rear of the boat.

Revealing: In the scene where Kasim dies, his shirt is all bloody, but there are no holes in it. The bloodstains looks painted on.

Continuity: When Indiana is fighting on top of the tank, he kicks the periscope. It spins counter-clockwise, but the handles inside spin clockwise.

Continuity: When Indy has crashed into the lion's house on the train, he takes the whip in his left hand. In the next shot after seeing the lion you can see the whip is in Indy's right hand just before he hits the lion and makes his chin bleed.

Revealing: The candles that adorn the wall in the Grail room do not appear to have a strong enough flame to put out the light they do that shines on the wall.  In fact, it looks like there are electrical lamps just behind the candle.

Revealing: In the scene when Indy and Kasiem are fighting on the the boat as it is being chewed up by the giant propeller, the propeller is more than half way out of the water; if the ship was in dry-dock the smaller boats wouldn't be able to up to the larger ship, on the other hand if it had run aground it would not be running its engines.

Continuity: When the zeppelin is shown turning around, the biplane that the Joneses are about to escape in is nowhere to be seen.

Continuity: At the very end there is a large near circular blood stain on the left sleeve of Sean Connery's shirt. When they ride off, the stain has disappeared completely.

Continuity: When Senior is rescued from the tank with a whip around his ankle, the whip dissappears a split second later, when he is being mounted on the horse.

Continuity: When Indy enters the beach he steps on dry sand and then on the wet part. A frame later, in a wide angle, he is still stepping on dry sand.