Did you get it right?
This soda fountain looks old, but two details are from a later time.

The Answer
The two modern mistakes are the contactless payment card reader and the plastic disposable coffee lid.
Here is why
- Check the counter near the register area.
- Look around the napkin holder.
- Those two objects do not belong in a 1950s soda fountain.
Why people miss it
The shiny counter has many small objects, so the modern items can look like ordinary counter clutter.
Did this one fool you at first glance?