During the storm scene, Lear's mustache comes lose and flaps in the wind. Orson Welles turns his back at one point in a failed attempt to stick it back on firmly.
Orson Welles reverses the wording of one line in Act IV, Scene vii. Instead of "You have some cause, they have not," Welles says, "They have some cause, you have not," which completely reverses the meaning of the line.