Aardman Animations's first fully-CGI feature film. The reason for using computer animation, instead of the studio's trademark clay animation, was the numerous scenes involving water, which is nearly impossible to do convincingly in stop-motion.
While Roddy (Hugh Jackman) and Rita (Kate Winslet) are in the fridge, one of the frozen rats is parodying Han Solo, in his famous carbonite pose from L'Impero colpisce ancora (1980).
At the beginning of this movie, when Roddy (Hugh Jackman) is going through his wardrobe, the outfit he forgoes, for the Elvis Presley-style rhinestone jumpsuit, is a replica of the original Wolverine outfit from the comic books. Wolverine is the role that made Jackman famous.
When Roddy is selecting a movie for the movie premiere, the DVDs with real titles are all DreamWorks movies.