Continuity mistake: When the seven dwarves run scared down the stairs and out of the door, Dopey pulls the handle of the door from the inside until it breaks out and falls away. The next scene when the dwarf opens the door, the handle is there again. (00:33:00)
Continuity mistake: When Robert Conway meets the High Lama, the High Lama is shown in a long shot without his crutches. As Conway approaches him and we see the High Lama up close, the crutches suddenly appear.
Revealing mistake: A disgraced Willy Wallace is relegated to a terrible desk in the bowels of the Morning Star. Some guy puts a ladder right above him, and various pictures start falling on him, who has already had used paper cups dumped on him by his terrible coworkers. During this sequence, the cup is glued/tacked onto Fredric March's hat in close-up, standing perfectly upright as opposed to the tilt of the other camera angle.