Anchor: A scuba diving class taking a picture during class time.
Entailed: Some people are in a scuba class.
Contradiction: Some people are taking ski lessons.
Contradiction: That thing is completely boring. 
Contradiction: The knowledgeable visitors know to look for Chinese heirlooms or leftovers from when it was a colony of Portugal.
Contradiction: "Nothing out of the ordinary," Sir James thought.
Contradiction: A tiny canine is scurrying across the sand.