Other mistake: At the very start of the Exodus there are three consecutive shots with the blowing of horns. In the next shot, while the camera faces the ground, there are multiple imprints of modern work boot or sneaker soles visible on the dirt (near the spotted goat), on the left side of the screen. These are not sole imprints of the time period. (02:59:25)
Other mistake: There is a scene where a dead Indian warrior is discovered. In this scene he is covered by a large flat piece of stone. When they pull away the stone you can see his chest rising and falling as the "dead" Indian breathes. Much easier to see when viewed in HD.
Other mistake: When the Id creature is melting through the door and Morbius is denying he subconsciously created it, the Commander draws his blaster giving the impression he will kill Morbius to save them if necessary. But Robby deactivated the blaster just a few scenes prior. Was he going to beat Morbius to death with it?
Suggested correction: That was a moment of desperation, so he wasn't thinking, and, well, yes anyway.
Other mistake: When the title card is shown, the copyright year is shown as 'MCMXXXIV' (1934). It was released in 1956 (MCMLVI).