In this episode, Glowface claims he found the X's secret homebase for the first time, but he found them once before in the episode X Takes a Holiday.
(after Homebase was stolen)
Mr. X: Okay, okay. Okay...okay. So, Homebase was in a snitch and he ran away from home, except that he is a home, so if he ran away from himself, the point is EVERYTHING'S GREAT!
Homebase What's your latest imbicilic plan? Are you going to create an army of muffins or build a gigantic water balloon?
Glowface: Hmm...(to Lorenzo) Write those down.
Homebase: (referring to X's) Ugh, you just missed them, you oblithering idiot.
Glowface: I am NOT an idiot! (to Lorenzo) Look "oblithering" in the dictio-mo-nary!