If you have visited PandaDroom before, you may well have noticed that in the pre-show area there are no seats. After walking around Efteling all day, the last thing that guests want to do is stand around (for what seems like forever) waiting to go into the theatre. The pre-show is very nice and I love the music, that is not the problem, the problem is the length of time that you are required to stand there! It is not very pleasant to sit on the floor either, especially if it is a wet day.
My (cheap and cheerful) suggestion would be to add some log benches to sit on, as this would be in keeping with the nature theming. Maybe 5 benches in the whole room? It would be better than nothing!