how is reality different from the ideal life set up by the party?

From the text:

Day and night the telescreens bruised your ears with statistics proving that people today had more food, more clothes, better houses, better recreations -- that they lived longer, worked shorter hours, were bigger, healthier, stronger, happier, more intelligent, better educated, than the people of fifty years ago. Not a word of it could ever be proved or disproved. The Party claimed, for example, that today 40 per cent of adult proles were literate: before the Revolution, it was said, the number had only been 15 per cent. The Party claimed that the infant mortality rate was now only 160 per thousand, whereas before the Revolution it had been 300 -- and so it went on. It was like a single equation with two unknowns. It might very well be that literally every word in the history books, even the things that one accepted without question, was pure fantasy. For all he knew there might never have been any such law as the jus primae noctis, or any such creature as a capitalist, or any such garment as a top hat.