Did you get it right?
Two modern food-service details slipped into this 1950s railroad dining car.

The Answer
The correct answer is: the flexible silicone cup lid and the transparent resealable zipper cracker pouch.
Here is why
- The cup on the left has a flexible molded silicone lid.
- A transparent cracker pouch on the front table closes with a modern colored zipper track.
Why people miss it
Both mismatches are small, color-matched to the table setting, and surrounded by authentic glass, ceramic, and silver pieces.
What answer did you get before checking?