Revealing mistake: After Indy escapes from the conveyor belt, he runs on some suspended planks while being shot at. Watch the planks: There's black masking tape where the explosives are (which disappear in later shots). Furthermore, right before he takes out his whip, he grabs a railing where the bullet has just hit, and you can see that the black tape is dangling loose after the spark.Sacha
Continuity mistake: When the Indian guest is given a beetle to eat during the dinner sequence, he pulls off the back of the insect. When he notices that Willie is not eating, you can see that he is only holding the beetle, but when the camera angle changes in the next shot, the guest is holding the insect with the part he pulled off next to it.