Not true at all....You have to follow the walkthrough to the letter or you risk breaking your game quest.
You can always repeat the scenes needed in the order they need to be done for that quest to complete anything you need to do.
The only bug is the panty bug where if you sell them to Billy before you use them in your room you lose the chance at +5 Stamina which doesn't really matter since you can get that stamina in other ways and more than enough to complete any of the tasks at hand.
There is no way to screwup and lose something other than that one stamina opportunity. The rest can all be done in just about any order and it is only the fact that you need the relationship points from one event to be able to proceed with others.