Madame Wolfstein is not a real person. The Berry Cross Country team, however, was 100% real at the time of filming.
Only one copy, on dvd, is known to exist. Its case is blue, as is it's title. This copy was found in a drawer.
'Jeb' filmed the tunnel scene without shoes. He was intent on keeping his shoes from getting messy, and insisted on filming the scenes in the resevoir tunnel barefoot, a process which lasted for 4 hours, and left his feet numb due to the cold.