As mvf-m11c said, it's likely not a misprint. WoC has run after closing before, so this would not be surprising. Sunset is generally around 7:00 pm by mid-September, so it should be dark enough by 8:15 pm for the show to be presented. Personally, I also think they do this (have a late WoC) to help distribute out the closing crowds because DL often closes at 8:00 pm as well. That way, two parks worth of guests are heading to the trams at the same time (I know that not everyone uses the trams, but the lines can get long when the park(s) close).