Well of course it is possible we see sections that have been repaired in the episode. But it comes back to the point is that they were supposed to be low on resources. So surely it's a waste to replicate new wall panels all the time.
That's exactly just the thing. How hard would it have been to leave a few burn marks in the corridors a while after major damage happened? I understand UPN wanted an episodic show in the same vein as TOS and TNG, but there still should have been more than just a nod toward continuity now and then. There should have been some evidence that the events of one episode had consequences for the next.