When they say that they learned to make fake ID's (to get into the presentation that Mr. Moore was giving) from the movie roger and me, it was just a simple way showing the hypocrisy that they found with Moore. The point that they make is that moore can do that to gain access to GM, but when some Canadians do that to him, it is wrong in moore's eyes. It just shows the double standard he works by.
Ah!! They feigned naivity. This is a better explanation. They were so devious that they were erecting a facade of ignorance. Oh we were his greatest fans. Oh how could he cut things out of context. Oh how could he back stab Nader.