In the cutscene for the first chapter of Story Mode, the Pomeranian falls over while chasing some rabbits, causing one of the rabbits to stop long enough to point and laugh at him.
The Lioness Hunting Diary mission starts off normal enough but the second-to-last animal you hunt is a boxing kangaroo with boxing rabbits as supporters, and the final mission is the weirdly out-of-context pteranodon.
An early mission involves the deer trying to find it's mother. Literally in the middle of the city, it encounters a pack of velociraptors. The sudden appearance of dinosaurs can either be this, or Nightmare Fuel.