Two Mistakes at This 1960s Library Checkout Desk: Answer

Did you get it right?

This library checkout puzzle shows a card catalog, return stamp, library cards, due-date slips, and books on the desk. Two small details belong to a later time.

The Answer

The correct answer is: The modern self-adhesive return label strip and the plastic clamshell bookmark package are the two wrong items..

Here is why

1. The card catalog, due-date cards, stamp pad, book cart, and librarian all fit the 1960s library setting.
2. The first wrong detail is the modern self-adhesive return label strip on one book.
3. The second wrong detail is the plastic clamshell bookmark package near the stamp pad.

Why people miss it

Library desks already have many paper slips and labels. The wrong items hide as normal checkout clutter until you notice the packaging style.

What answer did you get before checking?