After Dilbert starts a game of "Scrabble" with the word "it", Dilbert's mom makes the word "quixotic," using all of her letters and declaring a "triple word score"; the eight triple word score spaces are along the border of the Scrabble board, and not in the middle; thus, it is impossible to get a "triple word score" in the second overall turn of a Scrabble game.
During the first Scrabble game, Dilmom puts down the word "quixotic" as the second word of the game. Given Dilbert's first word is "it", it is impossible for Dilmom to have put this word on a Triple Word Score. It can be easily proved with a Scrabble board. Dogbert's claim that his word "quizzing" scores 188 points is also false, but given that Dogbert is cheating in the first place, that is more likely to be Dogbert making things up than an error.