I've recently read a couple of Famous Five books for old time's sake (don't judge me), and it hit me that so many of their adventures, perils and mysteries just would not have happened - or would at least have played out extremely differently - if the children had had mobile phones in their pockets!
Not quite the same thing, but it still seems so weird on The Apprentice, the week when they have the challenge to puzzle through a list of extremely obscure or ambiguous items and determine what they are, then find and buy them - all whilst having to pretend that the Internet on your phone is absolutely not a thing!
One of my favourites was when they were sent to buy a piece of specialist diving equipment known as an octopus, and they came back with an actual octopus from an exotic seafood supplier!