Many of the prehistoric creatures in this episode were inaccurate, whether it being unproportionally large, the way there body moved, or the complete lack of feathers on any of the dinosaurs.
When Sunil says, "I do believe in zombies, I ''do'' believe in zombies, I do, I do, I do!", he is clearly parodying a line said by the Cowardly Lion in The Wizard of Oz (1939).