The government was checking everything the people does.

The whole city has signs with big brother is watching you

People may not fall in love or have a sort of relationship with somebody

Winston and Julia had a secret and dangerous relationship, dangerous because they could be killed for it

Bryan wanted to catch Winston after he red the book

That it is difficult to take over a complete mind of somebody

A person can believe what they say to you also if it is nonsense

the story tells also a bit that technologie is dangerous for our privacy and our own way of thinking because they can monitor us.