When Price falls off his horse near the end of the film, the camera is much too close--the face of his stunt double is clearly visible.
When Richard pushes the freshly murdered Clarence into the vat, you can see Clarence take a deep breath and hold it, just prior to being submerged.
As Richard bends down to kiss the forehead of King Edward, who was dead his bed, you can see King Edward squinting both of his eyes slightly.
As two ghosts levitate away from the ramparts, the shoulders of their gowns rise up where the actor's harnesses are attached.
Just after Richard throws the ax through the stained glass window, you can see the shadow of the camera crane on the floor, rising higher and higher and pulling back.