Did you get it right?
Two modern packaging details slipped into this neighborhood milk-bottling room.

The Answer
The correct answer is: the plastic screw cap with a breakaway ring and the recycling-material symbol on the crate label.
Here is why
- The foreground milk bottle has a modern ribbed plastic screw cap with a separate tamper ring.
- The Hillside Dairy crate label carries a triangular recycling-material mark at the lower right.
Why people miss it
Both clues sit among convincing glass bottles and wire crates, and their colors match the cream-and-red dairy palette.
What answer did you get before checking?