The name of the opposition opponent of the final tennis game in the film is 'McNamara'. The name of this films' director is Sean McNamara.
A brief piece of the surveillance footage seen by Gwen and Roger early on in the film is lifted from 'The Matrix' (1999).
This is the only "Cats and Dogs" movie to not have a US theatrical release.
This is the first movie in the Cats and Dogs franchise to not feature any of the original characters.
Early in the movie when Gwen and Roger hear Pablo talk unseen, Gwen says he sounds like a chihuahua. Most likely a nod at the Beverly Hills Chihuahua movies, where George Lopez voiced Papi the Chihuahua in all three films.