Bob in Nicaea

Here's a question on which I'd appreciate the views of my hist fic-writing friends. What do you think of anachronism or near-anachronism used as a deliberate technique to lessen the reader's distance from the material? I'm re-reading The Last English King by Julian Rathbone and in the author's note he points out that "occasionally characters, and even the narrator, let slip quotations or near quotations of later writers or make oblique reference to later times. Some will find this irritating. For reasons I find difficult to explain, it amuses me and may amuse others. But it also serves a more serious purpose - to place the few years spanned by this book in a continuum which leads forward as well as back." Nothing new under the sun, in other words. This is an example of what he means: the year is 1069 or thereabouts and his protagonist, a Saxon Englishman called Walt, has just arrived at the town of Nicaea with his companion, a Frisian ex-monk called Quint:

There was a small crowd near the gate happy to be entertained by a couple of mountebanks, one who ate flames and spewed them back again, another who twanged away at a tuneless lute and wailed nasally above the noise he extracted from it. A sad ditty about how the answer to everything was blowing in the breeze. None of this was to Quint's liking.

Now in the first place he was right about being amused: I nearly had a coffee moment. But it did sort of work the other way too; I could see what he meant about the continuum and for a moment I was very much there with Quint (and sharing his musical tastes).

I had a somewhat similar reaction on reading Andrew Drummond's hilarious novel Volapük, set at the end of the 19th century, when I came across the character of Sir Thomas Urquhart, a real person who, were he still living at the time of the novel, would have been some 200 years old. Volapük is about the creation, use and misuse of language, and the impossible Sir Thomas merely emphasises the timelessness of its theme.

I haven't noticed this very much in historical fiction, but maybe I haven't been reading enough of the right stuff. Is it a more common technique than I thought? And do my hist fic friends use it themselves?