Qui Gon Spirit Plot Hole
So it's suggested in moments in AotC that Qui Gon can appear wherever the f*ck he wants, spy on people without their knowing (Yoda only was able to detect him in deep medication sessions, possibly with his permission), etc.
Why couldn't he just spy on Palpatine and figure out that he's a sith lord? Or do the same to Dooku?
Just another PT plot hole, I guess.