When Winston and Julia are together in the room upstairs for the second time, Julia asks Winston what time the clock on the wall says. He responds that it is 21 hours, or 9pm. When Julia leaves and Winston picks up the glass ball off the table, the clock behind it shows 2:30.
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.)
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.