|Theories may be removed if ...|
Many readers have wondered why Sansa Stark thinks that Sandor Clegane kissed her when he came to her bedchamber during the Battle of the Blackwater. GRRM has stated that the kiss will eventually mean something, but what?
George R. R. Martin on the UnKiss
When asked about the kiss discrepancy George R. R. Martin simply replied that Sansa Stark is an “unreliable narrator”, 
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. . .
He has added that the kiss “will eventually mean something”.
You will see, in A STORM OF SWORDS and later volumes, that Sansa remembers the Hound kissing her the night he came to her bedroom... but if you look at the scene, he never does. That will eventually mean something, but just now it's a subtle touch, something most of the readers may not even pick up on.
This has led to much speculation by fans on what he means and intends.
Sansa misremembering the name of Joffrey's sword
GRRM's reply when asked about Sansa misremembering the name of Joffrey's sword:
The Lion's Paw/Lion's Tooth business, on the other hand, is intentional. A small touch of the unreliable narrator. I was trying to establish that the memories of my viewpoint characters are not infallible. Sansa is simply remembering it wrong. A very minor thing...,but it was meant to set the stage for a much more important lapse in memory.
Has the Hound replaced Lady?
In an interview GRRM was asked: There's some speculation that you plan to replace Lady with the Hound, possibly?
What? Interesting speculation. I won't comment on that. [laughs].
Has the relationship between the Hound and Sansa had romantic undertones?
Questions submitted By: Moreta:
Moreta12: I understand, I've heard your opinion on that. In ACOK, it seems that the relationship between the Hound and Sansa had romantic undertones. Is that true?
- GRRM: Well, read the book and decide for yourself.
Moreta12: I've read the book and I've debated those particular scenes with a few others. Half say that it's romantic and half say it's platonic. I've taken the romantic stance.
- GRRM: It could be very different things to each of those involved, mind you.
Sansa Stark and the Tourney at Ashford
In the Hedge Knight a tourney is held in Ashford Meadow to celebrate Lord Ashford's daughter's name-day. By the end of the tourney five knights champion the Lady Ashford named Lyonel Baratheon, Leo Tyrell, Tybolt Lannister, Humfrey Hardyng and Prince Valarr Targaryen. This parallels Sansa's story throughout the Song of Ice and Fire series, who has been promised to marry/married to characters who share the same family names as Lady Ashford's champions from the tourney. Sansa was betrothed to Joffrey Baratheon, promised to marry Willas Tyrell and married to Tyrion Lannister. She is promised to marry Harry Hardyng. Following this pattern, Sansa will marry or be promised to marry a member of House Targaryen.