Raiders bloopers

In the beginning of the film, when Indy and Satipo first enter the Chachapoyan temple, spiders are clearly visible on Indy's back in one scene, and then gone in the next.
Right after Indy leaves the Raven Bar, Marion pulls out her necklace with the Headpiece to the Staff of Ra on it. In one shot, the chain is still around her neck but in the next, the chain no longer around her neck.
In the Raven Bar fight, Indy takes cover behind a wall as the Nazis are shoot at him. As Indy is firing back, you can see that Indy's gun switches from a Smith and Wesson revolver to a Browning HP automatic. Indy was supposed to be using two different guns, but the continunity was an error that occured during editing. Ford used the automatic more since it fired 9mm blanks (which is the standard blanks for film use).
In the scene just after the Nazi truck explodes where Marion was presumably killed, we cut to a shot of Indy drinking in a bar. Just before he is approached by the two Nazi gestapo agents, look closely to the left of Indy in the background and you can spot a man in blue jeans and a white t-shirt walk by smoking a cigarette. Rather out of place don't you think? This blooper requires a widescreen copy of the film to spot it.
In the flight to Nepal scene, just as Indy is leaving, the plane flies over the Golden Gate Bridge, but the bridge was not finished in 1936 (the year the film is set) since it took four years to complete (1933-1937).
As revealed by Imam, the height of the Staff of Ra is 5 kadam height (72 inches or 6 feet), but when Indy stands next to the staff in the map room, the staff towers over him. If the height of the staff were currect, this would make Indy about 4 feet tall.
When the truck explodes just after the Basket Chase, you can see a pole underneath the truck that was used it tip the truck over.
Just after discovering the location of the Well of Souls in the map room, Indy then walks into a tent to find Marion gagged. When Indy takes the gag off you can see that the amount of hair in Marion's gag changes from shot to shot.
In the original theatrical version of Raiders, when Indiana falls into the Well of Souls, Indy is confronted by a giant cobra that stares him down in a very suspenseful moment. For safety reasons, a plate of glass was placed between Ford and the snake. If you look closely you can see the snake's reflection in the glass when the lighting flashes. This error was later fixed by Lowery Digital for the DVD release of the film. The blooper can now only be seen in the old VHS coppies or in a theatrical print.
When Indy and Marion exit the Well of Souls, Indy has to push a large stone block out of the way. If you look closely, you can see the stone's shadow as it falls and it appears to bounce. Not something that a real stone block would do on sand.
During the Flying Wing fight sequence, you can clearly see that the plane's wheels are being driven by what appears to be a bicycle chain.
During the truck chase, blood on the windshield from Indy's gunshot window disappears.
During the truck chase as Indy is sliding under the truck, you'll notice that a trench has been dug underneath between the tires to allow the stunt man room to make it through.
During the Truck Chase, when Indy grabs his whip while under the truck, a red mark can be seen. It was placed there so the stunt man coud find the spot to attach the whip.
Right after the truck chase, Paul Freeman (Belloq) proceeds to hit the driver of their car with his hat, but the driver ducks before Belloq hits him.
In the scene where Indy threatens to blow up the Ark with a Bazooka, but wait a minute, the bazooka wasn't invented until WWII and was first introduced in late 1942, six years after Raiders of the Lost Ark takes place.
In the approach to the alter scene where Indy threatens Belloq with the bazooka, a fly lands near Belloq's mouth and appears to crawl in, but cannot be seen flying away. In our interview with Paul Freeman (Belloq), he points out that a few frames were cut out where the fly can be seen flying away. So according to Paul Freeman, he did not eat the fly.