What would be considered to be truth in your fictional world? Does everyone have to subscribe to one faith or one political view? What happens to the outspoken?
Is there "room" for nonsense in your world? Is humour encouraged? Or is it clamped down on because it can be subversive (and great satire is, of course. It has never gone down well with everyone!)?
Are your characters truthful? How do they handle having to lie if it is vital they do so? What nonsense does the government come up with (and every regime from time immemorial has come up with nonsense in its time!)? Do the people "buy it" or have they seen through it ages ago? Who controls the media and is it responsible, giving good investigative journalism (to name one example), or does it rely on the government telling it what to say?
Food for thought there I think.