[Note: This mail has been edited for brevity.]
. . . this is an inconsistency with ASoS more than an outright error. In ASoS, Sansa thinks that the Hound kissed her before leaving her room and King's Landing. In ACoK, no kiss is mentioned in the scene, though Sansa did think that he was about to do so.
Well, not every inconsistency is a mistake, actually. Some are quite intentional. File this one under "unreliable narrator" and feel free to ponder its meaning. . .