Anchor: Bicyclist dressed in black and white with white sunglasses on points at something.
Entailed: The man was wearing dark glasses.
Contradiction: The woman was riding the bike.
Contradiction: Tracking isn't relevant
Contradiction: Canaletto's works were the 18-century version of a modern postcard.
Contradiction: Looking through the old paper filing cabinet is the only way to find the information, it has not been digitalized yet. 
Contradiction:  Two men working on top of a building roof talking.