Continuity mistake: When Darcy and Kate are in the office when Kate is getting ready to go to the party for Farmer's Bounty, Darcy is supposed to press the elevator button, but in fact she presses a spot right next to it. (01:40:05)
Continuity mistake: In the close up shot of Kate holding the photos during her acceptance speech, the hand holding the photos is a man's hand. (01:46:32)
Continuity mistake: When Kate appears in 1876 New York, including at the ball, she is wearing a different gown to the dress she was wearing in modern day New York. (01:51:18 - 01:53:10)
Continuity mistake: At the end when Kate arrives at the uncle's house, Otis says "what seems to be the problem?" The doorman looks up at Otis, but the very next shot is Kate and the doorman is looking at her. (01:51:50)
Continuity mistake: Toward the end of the movie when Leopold is making his speech of who he is going to marry, there is a shot of the crowd in the room. In the very back there is a person that runs in and stumbles about. Then there is a close-up shot of Kate coming in and stumbling around the exact same way. (01:51:55)
Plot hole: Stuart establishes that there is only one of you and that when you travel through time you can repeat things, but it will be you and not your double that does it. But, at the end, when the Duke is going up the stairs and the uncle says "Where have you been...", the Duke is wearing the same clothes as the first time. Yet we see that he goes directly from the time portal to his house in the ballroom raiment of the later scene. Where did the old clothes come from?
Continuity mistake: Stuart has pictures from the ball at Leopold's that show Kate standing at the back of the room looking in the room. At the end of the movie, you can see the set up for that picture. However, for Stuart to have *taken* that picture, he would have to have been standing on the platform with Leopold to take the picture, but he's not there.
Continuity mistake: During the dinner scene with Kate, Leopold and Charlie, Kate gets up and starts picking up her plate and the ketchup bottle. The shot changes to Leopold starting to stand up, then it switches back to Kate who is picking up her glass of wine instead.
Continuity mistake: When Hector the kid offers Leopold some Pirates Booty - Bart the dog has changed positions on the couch.
Continuity mistake: In the apartment scene where Kate is wearing a light blue turtleneck sweater and fighting with Leopold, her collar is up in one shot and is folded over neatly in the next.
Factual error: Otis elevator is called that because Elisha Otis invented the modern elevator in 1859, 17 years before the movie takes place. It had nothing to do with the Duke of Albany.
Continuity mistake: Near the end when Kate is in her hall gown, her dress bodice is plain and the skirt comes to her ankles. When she stumbles in to Leopold's party, her bodice now has short black lace and her skirt has a train and a bustle.
