Continuity: Ben-Hur places his crown on a table when he visits the fallen Messala, but upon returning the table and crown are gone.

Revealing: During the chariot race, where the contestants are riding towards the screen, tyre tracks from the camera vehicle are clearly visible imprinted in the sand.

Continuity: When Ben Hur finally defeats the bad guy, his opponent's wheel disintegrates. However, as the chariot flips over, we see a complete wheel on both sides.

Revealing: In the scene where one of the ships collides with the other you can clearly see that the rowers being hit are dummies.

Continuity: Count the number of chariots that start the race. Then count the chariots that get thrown out and the number that finish - there's one too many. There are 9 at the start, 6 get thrown out, and 4 finish.