Trivia: Breckin Meyer, who plays Jon, is allergic to cats in real life.
Trivia: Bill Murray agreed to be in the film without reading the full script upon seeing the name "Joel Cohen" listed as a writer. It turns out he thought he was signing onto a film co-written by "Joel Coen" of the Coen Brothers fame. It wasn't until he began recording his lines sometime later that he realised his mistake.
Chosen answer: Jon makes educated guesses in the comics based on Garfield's body language and surroundings, he doesn't actually hear Garfield in either medium.
Phixius ★