When Winston says "Bugger." at the start of the film when he has the cigarette in his mouth, his lips are most definitely not in sync with the word. And it even sounds dubbed over.
In the final scene, when Winston and Julia are playing chess, Winston uses a tactic of going around and hitting from behind. Only minutes later, the news report that Oceanarian forcer defeated Eurasian forces in Africa by using the same tactic. Nothing major but it makes a good point about the rate of citizen monitoring and news manipulation in Oceanaria.