Anchor: A child does a handstand at the edge of a beach.
Entailed: A kid is doing acrobats.
Contradiction: A child is hiking in the mountains.
Contradiction: We never had a four wheel drive vehicle and never got stuck.
Contradiction: Some homes could be bought for under $8,000 in 1949.
Contradiction: Mary understood that Poirot would be taking a while because of errands he had to do. 
Contradiction: There used to be a fort until 1812 but the troops blew it up.