Actually the window in Picard's Ready Room is clearly not on the ship. If you look at the model, there are NO perfectly vertical walls. They all have some slant to them.
It's a spaceship. It would have thick, multilayered walls that could easily be curved on the outside and straight on the inside.
This is also why the Shuttle Bay never worked. I always wondered why they didn't simply put the shuttle bay doors on a slant. That would have matched the model. Instead the doors rise straight up giving the impression of yet another perfectly vertical wall.
Okay, that's a valid point. But it's a grand tradition in TV and movies for interiors and exteriors to have discrepancies. Just in Trek alone, the TOS shuttlecraft and the
Delta Flyer were bigger inside than outside, the TMP rec deck couldn't fit in the saucer, the TMP engine room had a corridor in front of it stretching impossibly far forward, and
Voyager seemed to have a dimensionally transcendental shuttlebay that could house both the
Flyer and Neelix's ship and still have room for multiple shuttles (not to mention having a "Shuttlebay 2" despite only having one hangar door -- and that door was too small to admit the
Flyer).
Beyond Trek, plenty of other fictional spaceships have interior sets that are too big in proportion to the exterior designs, including the
Jupiter 2 (
Lost in Space), the
Discovery (
2001),
Starbug (
Red Dwarf), and the
Millennium Falcon (some obscure film whose name escapes me). And it's not just ships; the FLAG semi in
Knight Rider had the same property.
Then there are the changing dimensions of the 4077th in
M*A*S*H; the tents and structures in the compound changed their relative spatial relationships depending on whether an episode or scene was shot on the soundstage or the exterior location.
