In The Cross-Time Engineer, a story of an engineer kicked back in time, who proceeds to try to remake his society around him. (Gee like that's a new idea, but it is still a lot of fun).
I remember there is one point where he gets cartography going and requires that North and South as we know it, be reversed, sort of as a perverse way of defanging later Polish jokes.
What other such 'innovations' does he introduce, just to defang a future Polish joke. (It is a kind of amusing and unimportant sub plot that continues in the theme of just being a fun series to read!)