When Rainier opens the telegram announcing his newspaper job offer, he (accidentally) tears it. In the next shot, he's reading an untorn telegram.
When Margaret and Charles are examining the suitcase in the hotel office, in one shot the case is closed; in the next shot, it is opened, and Margaret is fingering the shirt sleeve.
The pattern of water and mud on Smithy's coat changes after the accident as he walks along.
When Margaret opens the door to Charles Rainier's office, she is carrying a file under her left arm with the index label at the top. When she enters the office, the label is at the bottom.
When Rainier and Kitty are having lunch at the Savoy, Rainier opens his cigarette case, offers a cigarette to Kitty, and takes one himself. In the next shot, both of their cigarettes are lit, even though neither Rainier nor Kitty were seen to light them.
When he asks the date, Rainier is first told that it is Thursday, and then that it is November 14, 1920. In fact, November 14, 1920 was a Sunday.
It has been reported as an error that Smithy refers to his newborn's teeth. A newborn does not have teeth. From the reaction of the clerk and Smithy, it appears to have been a joke.
The milkman said that he had synthetic pain, but he meant sympathetic pain. This is most likely to be joke to represent the milkman as an uneducated person.
In the last scene where Smithy goes back to the cottage, the flowering tree on the path has not changed or grown at all in the 15 years since he was last there.
When Rainier hosts a dinner for the Prime Minister, the invitation card can be seen on screen. It says, "...requests the honor of your company." The English spell it "honour".
After settling the strike at the cableworks, Sir Charles orders a double Mack(?) and soda. No soda is added to the whiskey and the drinks are consumed "straight"
The bulk of the story takes place from 1920-1935, yet all of the women's hairstyles and clothing are strictly and very inappropriately in the 1942 fashion.
In the final closeup of Paula as she and Charles are embracing, she is obviously speaking but only the closing music can be heard.
In the sequence where Rainier (Ronald Colman) sees his wife off at a London railway station (at around 1h 53 mins), there's a tracking shot as they walk along the station platform. The shadow of the camera is briefly visible on a pillar moving through the foreground of the shot.
they were traveling away from melbridge and the asylum so how can the inn and the cottage be in the same town?
A shadow of the boom mic can be seen on the wall above the picture on the left of the doctor and Paula when Charles is in bed after collapsing in the theater.