As far as I'm concerned, it's a rule of fiction that the narrator isn't supposed to say anything that isn't true. He/she/it can play with words so as to give a false impression and fake us out, but strictly speaking, what's said needs to be technically correct. DS voiceovers break that rule sometimes, and actually lie.
That comes under the heading, though, of all those missing screws and squeaky unoiled joints that DS is full of, which to many give DS its charm. I feel betrayed by the lie, then I shrug and move on...
As the years went on, the voiceovers seemed more and more mechanical and uninteresting, but there were still interesting things in them, such as Jonathan Frid doing one (rare in itself), and in his real Jonathan Frid voice!
I figured all the Lauras were Collins' by marriage and therefore their records would be on the Collins shelf. But I wasn't thinking it through.
For 1897 Laura, this was probably true. Maybe I shouldn't say any more...