To be fair, the planners had done the sensible thing and put a control in the entrance to the subway, so it would have taken a perversely bad routechoice to cross at the incorrectly-mapped-as-crossable street level. [Edit: ignore me; I forgot that the courses went the other way through the subway at the start of the course. Personally, I would just have given them that control twice.]
Worse, I think, are the thick purple lines bounded by tiny strips of olive green that did for Daniel Hubmann, among others, in the knock-out qualifier (see the 163-175 leg):
https://eventor.orienteering.org/Documents/Event/5...