Ratchet and Clank Future: A Crack in Time Easter Eggs

In the cutscene where Dr. Nefarius and Lord Vorselon are playing an arcade game, Nefarius as himself in the game uses the Hadoken plenty of times and the Shoryuken once. The Hadoken and Shoryuken are fighting techniques from the Street Fighter series.

During the battle between Ratchet and Dr. Nefarius, use the Groovitron Glove on him and he'll do a somewhat similar dance to Micheal Jackson's Thriller dance.