@susankayequinn Literally just yesterday I learned about Terry Pratchett's German publisher inserting soup ads into The Light Fantastic back in the 90s and I thought "oh that's so gross, surely nobody will ever do that again" 
Terry Pratchett and the Maggi Soup Adverts
Back in the 90s (starting with Moving Pictures) Terry Pratchett (yet to be knighted) changed his German publisher. A rather radical move in the market for someone who had been published by Heyne for a dozen books to raising sales. I remember reading it in the Jahrbuch der Science Fiction and Fantasy 1994 (Annual of…
Stuffed Crocodile (gmkeros.wordpress.com)