It's fairly standard that blinds on doors have to be open as this allows the crew to observe outside the aircraft. Passenger window blinds though aren't normally subject to such requirements.
I remember being told off once for lowering all blinds prior to passenger boarding (reson for doing so is long story). The Purser told me that it was a safety requirement to have all blinds UP and he/she made me go around again raising them all.
Indeed, a check in our SEP manuals proved that he/she was incorrect.