This can also be done with fanfic by inserting text every so often to point out gross errors in characterization or whatever.
The Protectors of the Plot Continum MSTed several fics where bad authors had wreaked havoc on canon.
> chopper, but was pushed back by the
ARL <soldier>: No shoes, no shirt, no service.
Author MST-ing: O.O I don't even know where to start on that one...
Friend: No, I can't get it to run on my computer.