Audio/visual unsynchronized: In the scene when Richard tells King Edward of Clarence's supposed treason, two monks are singing hymns from a large book: their lips are not only out of sync with their singing, but with each other.
Audio/visual unsynchronized: When Richard and Buckingham are standing over Edward IV's deathbed, and Buckingham says 'To part the Queen's proud kindred from the princes', Ralph Richardson's lips are out of sync.
Continuity: For one shot at the end during the battle scene, right around the famous "My kingdom for a horse!" line, Richard's left hand has all five fingers. During the rest of the movie, Richard only has three fingers on his left hand as part of the character's deformities.