First thing I noticed was the Freeze the Cat marquee! I worked on PR2 and when it was shelved it was COMPLETELY FINISHED! Kudos for booting up successfully and playing! The Dinosaur characters ARE selectable - normally they'd be unocked simply through more and more plays - there are definiely secret unlock combos (or maybe do so in options before bootup?) for individual if not ALL of them. The building structure which shows the seven human characters adds the corresponding Dino characters on top
I also noticed at 3:45 the ennemie actually transform into a monster/dinosaur?