Anchor: Is this the key that was lost?" He drew from his pocket the key that he had found in the lock of the despatch-case upstairs. 
Entailed: He had found a key in the lock of a case upstairs. 
Contradiction: He found the key downstairs in a closet. 
Contradiction: "Dave Hanson, you know nothing about engineering, either here or in your world."
Contradiction: there is a painting on the statue
Contradiction: Two people are walking through town.
Contradiction: Two men playing outdoors.