You see a lot of different people doing lots of different things when you search for that bespectacled master of concealment in Where's Waldo? books, but the books are for kids so you don't expect to see nudity.
But back in 1992 a detail oriented mother from Nashua, New Hampshire named Eileen Godfrey noticed to her horror that the Where's Waldo? puzzle she'd bought for her daughter Jessica contained the dreaded female nipple:
Turns out the tiny nude was in Martin Hanford's classic book from the very beginning, and may have gone unnoticed because nude sunbathing is legal on UK beaches, so British publishers likely didn't see the tiny nipple as a problem. Guess we showed them!