When Sally finishes her second glass of champagne whilst Chris attempts to dissuade her from ordering anything else, she drains the glass. In the next shot, the glass is full again.
When Sally and Chris place their drink orders in the Troika bar, Sally's jacket is buttoned up. After Chris speaks briefly, the camera immediately cuts back to Sally, whose jacket is now unbuttoned.
Whilst eating in Sally's room, Chris has a fork in his right hand. In the next shot, his hand is at his side and he reaches over the plate to pick up the fork again.
Whilst most of the film is a flashback set in the early 1930s, all the costumes and hairstyles worn are straight out of the early 1950s.
In the nightclub on New Year's Eve, the drummer does a drum roll, then a cymbal is heard without the drummer actually hitting the cymbal.