In the downhill skiing toward the end of the film, Larry does a number of tumbles and somersaults. One time he flips over a ledge and comes down without any ski poles. The next scene shows him with ski poles as he comes to a stop.
Larry and Karin go upstairs to bed, after telling his business partner he had just gotten married. While sitting on the bed arguing about going back to New York, the scene goes back and forth between the two as they argue. Toward the end of the discussion, Karin's (Greta Garbo) hair changes. It's the same style, but it's clearly been combed recently. Her hair is bigger (has more body).
During the Latin dance, Katherine's hair is longer and more flowing in the long distance shots (a dance double for Garbo) than it is during the close-up shots.
When Katherine is looking at the photo of Karin the close-up of the hand holding the photo shows much darker nail polish than Katherine has on.
When 'Katherine' utters the line, "I suppose when you spend all your time rolling about in the snow that it does something purifying for your character," the movement of Garbo's mouth does not match the last three words (i.e., when the shot changes to a side angle of her right face).
When Karin has Larry's business partner and secretary in for breakfast, the shadow of the boom microphone can be seen moving on the kitchen's stone wall and door frame.
Larry tells 'Katherine' that she looks younger than Karin; 'Katherine' responds that she is - by fifteen minutes. 'Katherine' next says to Larry, "How lucky you are to have captured my little sister", instead of saying that Karin is her bigger or older sister as she should have. 'Katherine', from thereon, continues to call Karin her little sister.