when CLAMP release the chapters in the magazine, ocasionaly things are forgotten, kurogane's scar on his left hand (remember he reeivexd it from tomoyo) things are also neglected, creating timeline problems. such as, when ch 119 was it, when kuro is running down stairs of the Gov't building to the basement, he is clearly carying souhi, but in ch 120m he asks mokona to gie it t ohim. where did souhi go? when the Tank was released, it was shwon that Kakero(sp) told him that he cant bring the sword into the basement.
also sometimes they change the way somethings occur, improving it...such as in 119 when fai used his magic, they greatly improved it by makign it a full page spread versus a 3/4 panel.