Firstly let me say congratulations to the guys who organised the display - it did look good!
As for the paper throwing, I was standing at the back of the POD and I'm 100% sure that some - if not most - of the paper was thrown on to the park when no one was close by but having said that, there was some folk who were throwing paper when they got a corner and although not all, there was more than a few that were thrown was from the end section.
Sadly, as someone else said, I think that the club will be reluctant to allow another display of this type.
A few fans have wasted it for the many and undone the teriffic efforts of the guys who have tried making the match day experience better but paper or brick, UEFA wont be happy.