I completed the quest to kill moto runner, but I still have his head in my inventory. I cannot drop the head, or even pass it to one of my companions, the game tells me I cannot drop quest related items but the quest is complete... I shouldn't have this head still should I? Has anyone else had something similar happen to them?

Yes i have this exact problem ... im sure colonel shu asked for his helmet but he still wont take/remove it. I cant even jury rig the thing :brokencomputer:

this occurs with a lot of items. also vice-versa, apparently, with the platinum chip(ie. main characters not giving them to you). I have 5 snow globes, just because I have a habit of picking one up every time I see one, so there's a useless weight of 5 in my inventory which I can't drop because it's "quest-related". there's nothing you can really do about it, except try and avoid things that have an uncommon names and aren't related to quests/paths that your currently on(ie you probably won't want to pick up "legion raid plans" if your working with the legion. you ARE their plan, lol)