Mason the Mastiff is a young actor just starting to break into the Hollywood film industry. In the real world, his first role was in Transformers (film), where he's owned by Sam Witwicky's best friend Miles. It's unknown what his first break would have been within the movie's universe.
- In the movie's end credits, Mason is credited immediately prior to the voice of Ratchet, long-time television and film actor Robert Foxworth. Ouch.