What is considered a "glitch" in guitar hero 2 for career mode? Is this something you can replicate?

Yeah I have the exact same question too. I have asked @brandonltxxp and he said its about trogdor.

buying trogdor then using the unplug glitch in practice mode so that every song will play trogdor instead is faster than playing through the career normally, so there's a separate category banning the glitch. check my expert xbox run for reference