Design fail or user error?

Two packaging fails, or is it two user errors by me?

First, some vitamin C tablets from Boots. Orange and white packaging. I assumed they were orange flavour.

Silly me. Obvious really, they were blackcurrant.

Two tins of paint next to each other on the shelf at B&Q. The right colour. I picked them up.

Painting started with two people, each with a tin, at opposite ends of the room. Paint didn't quite look right in the middle. Aha! One silk, one matt (see - at the bottom of the tin. Obvious really). Is this user error? Could B&Q have put the silk on the shelf above the matt?

Could Dulux have put all the information I needed on the label? Or is it me?