The Devil Wears a Lapel Pin - S11-E7
Other mistake: Francine tells Roger that she's jealous that he's starting college, but in the pilot, she mentions that she met Stan in college.
Criss-Cross Applesauce: The Ballad of Billy Jesusworth - S11-E17
Continuity mistake: When the game is tied 10-10, Yao Ming and Roger are in the circle at half-court, but when Ming checks the ball back, they are out and in front of the circle and not at half-court anymore. When Roger starts to dribble, he is back at the half-court line, all without them moving.
Chosen answer: It is just the decision of the creators to do so.
MasterOfAll