As Cathy walks uphill to see Heathcliff, her entire costume changes.
Cathy's muff disappears when she turns around after entering the room.
When Cathy begins to chase Heathcliff in the rain, Ellen brings her a shawl and begins to drape it over her shoulders. In the next close-up of Cathy's face, the shawl is over her head, and she is holding the two sides together under her chin.
When the newly-rich Heathcliff returns to the Linton home after Cathy's marriage, there is a lock of hair hanging over his left eye. In the next closeup shot, however, his hair is neatly brushed away from his face. The lock of hair continues to appear/disappear through the remainder of the scene.
(At around 6 mins) When the new tenant of The Grange, Mr Lockwood,(Miles Mander) is woken up by a banging shutter in the bedroom, he walks over to the window and puts his hand through the broken glass, then withdraws it. After he hears the ghost of Cathy calling out in the distance,he turns and shouts for Heathcliff and it can be seen that the broken pane is intact before Heathcliff enters the room, orders Lockwood out, then walks to the window and the glass is shown broken again.
In Cathy and Heathcliff's romantic scenes on the moors, and in the open window as Cathy is dying, the wind is blowing powerfully, yet the background clouds never move or change shape.
When Heathcliff argues with Cathy about going out with Edgar, he runs to his room and breaks a window with his fist. The outline of the broken pane can be seen before he hits it, as it had been pre-cut to make it break easily.
Though the social situations, and even the soundtrack, are consistent with the novel's timeframe of 1770-1801, the Colonial/Napoleonic era, the costumes are an odd mix of mid-Victorian and American Civil War.
Pieces of classical music played during the dances at the Lintons' home would never have been played then, some were not even composed at that time. The type of piano shown was not used then.
When Cathy returns to Wuthering Heights to confront Heathcliff about his engagement to Isabella, she turns to leave, and when she opens the door to storm out, the set behind the door can be seen for a split second.
When Cathy was recuperating in the garden and Linton was proposing to Cathy a man (stage hand? ) can be seen crawling through the bushes just behind the two actors.