What is the mistake on the back of a 1970 quarter?

Have you ever taken a closer look at the reverse side of a 1970 quarter? If so, have you noticed anything unusual? The mistake that many collectors and enthusiasts talk about is a subtle one, but it's there if you know where to look. Can you guess what it is? Is it a misspelled word? A misplaced date? Or perhaps an unexpected design element? Let's dive in and explore this intriguing aspect of coin collecting and numismatics.