Garbled references to the past.
In the novel, on which it was based, there are a couple of what I think are garbled references to the past. Firstly he makes reference to a statue of Big Brother, on top of a column, I think in Victory Square. I take this to be Nelson's Column. He says that it is commemorating BB defeating the Eurasian air force in the Battle of Airstrip One. This I take to be a garbled, altered history of the Battle of Britain.
The other one is when he goes into the pub and talks to the senior citizen (not shown in the film, although you do briefly see the outside of a pub). The old guy is going on about the price of beer and how much better it was "before the war". When Winston asks him which war, he replies, "It's all wars". This I took to be a garbled memory of the First World War ("the war to end all war"). I did look at the price of beer before WW1 and it was about the same price which he was quoting (yes, I have too much time on my hands!).