One very common scenario for knowingly faked "results" is this: PhD Student has his/her funding running out and gets set an ultimatum (explicitly or implicitly). PhD student fakes something, sometimes looking pretty good at first glance. Advisor is too stupid, lazy or full of him/herself to notice. Paper gets published because advisor is "respected" in the community.
I have seen this happening quite a few times, including one case where all authors, except the first one (the PhD student), wrote what was basically a retraction a year later. But did anything happen to these people? No. The PhD student still has his PhD, despite his results being essentially worthless. The other authors still have their reputation. The faked publications were not retracted. I did recognize the fake in 10 Minutes by numerous inconsistent things and numbers that did not add up and did not make sense at all. None of the reviewers apparently did. Just when people tried to reproduce the results and failed were some question asked. But as I said, no consequences for blatant scientific misconduct by several people. For me, this nearly cost me my PhD as my advisor was not even capable of understanding the fake after I explained it to him in detail and somehow though they were doing something vastly superior to my work. While the low-point of my scientific work, it made me understand that most so-called "scientists" do not qualify for that distinction.