I don't see a thread on this? A few nuggets:
http://www.guardian.co.uk/tv-and-ra...11/may/16/neil-gaiman-doctor-who-doctors-wife
Because I came up with the story before the Year Four Specials aired, I was able to ask them to keep the Christopher Ecclestone TARDIS interior. It stood in the studio for an extra eighteen months, and they lied to anyone who came past about why it was still there.
1) Yes, Pull to Open obviously refers to the hatch. But it is an instruction, and it is on her door, and Police Box doors did open out. (Opening in makes much more sense for a spaceship though.)
2) Yes, there were lots more TARDIS rooms in earlier versions of the script. I was particularly fond of the Zero Room sequence, with Rory having to learn to levitate, but alas, Zero Rooms and levitation cost money and take time to shoot, as do Swimming Pools and Halls of Mirrors, and we were all out of both at that point.
However, now we have TARDIS corridors existing as standing sets. We never did before. And that means that other writers can use the corridors to go somewhere. Like the New Swimming Pool. Or the ballroom.
http://www.guardian.co.uk/tv-and-ra...11/may/16/neil-gaiman-doctor-who-doctors-wife