Did you get it right?
The community cannery contains two packaging details that do not fit the period.

The Answer
The correct answer is: the white snap-on plastic freshness lid and the adhesive tamper tab on the peach-jar label.
Here is why
- The peach jar at the lower right uses a flexible white snap-on plastic lid instead of a metal canning lid.
- A small modern adhesive tamper tab crosses the top of the Spiced Peaches paper label.
Why people miss it
The clues sit on a genuine-looking jar and use pale neutral colors, so the busy rows of period-correct metal lids pull attention away from them.
What answer did you get before checking?