Actually I was just mentioned how it was portrayed in the KQ6. Specifically, that he looks inside, sees that it was a kitchen. Then walks in, cook yells at him, then he walks out. He wouldn't have known it was a kitchen, if there was a hallway there. All he would see would have been a hallway. Not to mention, in long path, just staring at the door tells you its a kitchen... No way he should have known that of course (since in long path he doesn't actually get a chance to check the door), but all-knowing narrator knows.
You moved the kitchen, I get that... But don't try to rewrite KQ6's intent... Because it was very specific. So much so that KQ6 Hint book, and King's Quest Companion, etc, explicitly state that room as a kitchen. Its very clear what the designers were going for at the time KQ6 was made.
The kitchen isn't the only difference in your castle's architecture, that isn't explained in-game, but I won't go into that. Last time I did, the TSL's designers claimed a wizard/Shamir did it, and did it along with the kitchen

.
What you choose to do, and what the Sierra designers chose to do are two different things... Your game takes place in an alternate universe. 'que sera sera'. The fact that you changed things actually doesn't bother my 'enjoyment' of your game, its still interesting play. I just find it interesting to discover things that are different. Like in those 'spot the differences' artworks.
By the same logic Graham must have always slept in his throne room since there are no other visible access points to Castle Daventry in KQ 1-3. I guess Rosella steps through a wall when she walks south to Graham's bed chamber at the end of KQ4 because I couldn't walk there in previous installments when I had full control of Graham.
There is actually a simple explanation, there is a door there. As stated in novels. Graham just chooses not to open them/turn the handles, etc, in KQ1 original. In KQ2 and KQ3, you don't have full control in the throne room, so its not really a valid point.
On the one hand, in KQ6 disk version, as the room pans, there is no door there, LOL. So uh maybe he does step through a wall,

. or they bricked up the doors between KQ4 and KQ6,

Or maybe one of those fancy smancy doors designed to look like the wall (went to Buckingham Palace they explained about some doors that were designed to look like a mirror and furniture, heh heh).
http://www.youtube.com/watch?v=zmt6gE1k9A8an entire back story for Valanice that was never mentioned in the game that even in some ways contradicts the original game manual which by your logic should be gospel because it came first and was written by the original creator,
Hmm, how does it contradict the manual? The companion actually repeats what the manual (the original creators) said about Valanice, and then extends it from there. The companion only tries to explain what the manual said about her.
All the manual (original creators) has to day about Valanice was;
This is the maiden Valanice. She is from the kingdom of Kolyma, and is known for her goodness no less than her beauty
It goes on to say she was kidnapped from Kolyma by the witch Hagatha.
The companion states;
King Graham, our most wise and beloved monarch, took to wife a maiden of the tropical land of Kolyma. Valanice is her name, and her beauty, wisdom and goodness are beyond compare.
It also says she was kidnapped from the land by the witch Hagatha.
I already covered the additional information that companion added. As I said before the KQ2 manual states that Valanice was from the kingdom of Kolyma, and was kidnapped from there by Hagatha. As it has been stated if you were going by the game and manual alone you would be left with questions.
The companion just tried to answer some of those questions, and give a plausible explanation for what the manual didn't explain. It didn't actually change anything, it repeated what the manual said about it, and just expanded on it.
You seriously can't complain about the companion, because the problem Katie was complaining about, and accusing the companion of committing (I.E. 'where did valanice live'?), was actually the problem with the original game documentation itself (by the developers). The problem was not with the companion (which attempted to avoid that particular problem).