See The Planning That Goes Into What Appears on Screens Within Movies
A year or so ago, I wrote briefly about how I used to be an extra on some films and TV shows and how I've seen my share of fake graphics used to make screens in the background of shots appear to be functional and normal. Projects often populate them with specific content that enhances the fictional world they're trying to create; for an example, watch this video focusing on the interfaces of Avengers: Age of Ultron.
Today, I stumbled across this really solid video from Vox that interviews one of the men responsible for those kinds of background graphics on screens within movies, and it's a fascinating peek into an aspect of filmmaking that many of us likely take for granted and don't ever consider. Check it out, and maybe you'll get as much out of this as I did.