Max 2 casts have no connection at all with the original Max. No single actor, actress or crew member in Max 2 appears in the first Max, even the dog.
The Apple iPad mini that was featured heavily in the film was sold to a fan in New York.
American Humane Association monitored the animal action. No animals were harmed®. (AHAD 06338)
After the movie is finished, we are shown pictures of some of US presidents with their dogs.
The first film was made by Warner Brothers Pictures and Metro-Goldwyn Mayer, this one is made by Warner Brothers Pictures and Orion Pictures.