I'm a bit late for the party, but still went and tried my lists too. Two pages of failures with dvd specials/etc and differently named existing entries.. but these few failed for the sole reason of not being listed on Anime-Planet:
Black Jack - The Child Who Came from the Sky
Black Jack ONA
Cosprayers the Movie
Monkey Punch Manga Katsudou Dai Shashin
Tenpou Ibun Ayakashi Ayashi Inferno OVA
Gedou Otometai + Love Pheromone = Akahori Gedou Hour Rabuge
, I remember there were some troubles when it comes to adding this one?
My manga imports failed.. more.