After the rack torture scene, O'Brien removes Winston's front tooth. Later, in the rat mask torture scene, his tooth is back again. (In the book, Winston is given dentures after O'Brien pulled the tooth, but this was not explained in the movie.)
Winston reads a newspaper article titled "INSOC IN RELATION TO CHESS BROTHER WINS." The party name should be spelled "INGSOC."
At around 52:40, on the bottom left of the screen, Julia places a piece of bread on the table and it falls to the ground, which she ignores.
During the rat cage torture scene the netting on John Hurt's short-cropped hairpiece can be seen.
When the telescreen is broadcasting the news that Ogilvy has been awarded the order of Conspicuous Gallantry, the announcer says that Ogilvy has received the order for his actions against the forces of Eastasia. However, at that point of the movie Oceania is at war with Eurasia, not Eastasia.