Little bug!! Seriously!?! It's a GAME breaking bug!!
Case in point (first one) if you go interact with the quest elements to get the picture of your butt before you talk to the Spider guy you won't get the dialog prompt to further the quest.
Case in point (second one) the game refuses to let me use the wrench on the pipe to turn it on the knight. It keeps saying I have no need to do that! And I checked a walkthrough!
The first time I was able to progress by using an old save point and do the quest in strict succession. I wont keep doing that every time this GAME breaking bug comes along.
Little problem. Yeah, right!!!