When at the end of the film Gobby displays the finished painting of Christable; the face and expression is different than that of the painting shown in his studio when Christable was sitting for him.
When Curtis is talking with Christabel during the charity ball; he places his hand on her right elbow. But on the next cut as he leads her away from the balcony; the orientation of his hand changes and is now above the elbow.
When Curtis is trying to get another ticket to the opening night; you hear Donna's voice off screen telling him to call Joe Bishop and Curtis reacts to it. But on the next cut after he has made the call; the exact audio of her off screen voice telling him to call Joe Bishop is repeated. This time he does not react. Apparently an error was made during the editing process and the dialog was inserted twice.
The Carey Estate shown in the magazine photo that Christable was reading is completely different one than the actual Carey Estate seen through out the film.
When Christabel returns home to the Carey estate after being with her lover; she opens the door and enters as the butler is approaching to let her in. Normally in such a large estate especially with the owners away; the entrance door would be lock. But the butler did not get to let her in nor did she use her key. At the end of the film Christabel surrenders her key to Gobby which proves that she indeed had a key to the house.