Even as he's in the middle of a transaction with the ticket booth attendant, Jon and Liz, can do nothing but talk about Garfield. Liz must know she's going to be entering weird psychological territory in the Arbuckle house, because neither her question nor Jon's answer are the way one would speak about a normal cat/master relationship. This feeling must be gleaned not from Jon's behavior in the office, where he is all-eyes-on-Liz, but Garfield's tendency to show up in disguise or as a third wheel on their previous dates. One can't help but wish we'd witnessed the missing scene of a crying Garfield begging Jon not to leave. If you know someone's got such a codependent relationship in their life already, why go out with them? Press one for pepperoni, folks.
While I appreciate Garfield misbehavior in Jon's absence, and Jon's clueless belief that Garfield cannot function without him, I'm not sure the cat's behavior is wild enough to justify the punchline. After all, isn't letting Garfield eat pizza something Jon does on a daily basis anyway?
Thank goodness for the innovations in interactive push-button pizza-phone technology or Garfield would be stuck in a situation like this:
Boy would he feel dumb!
Also: Either Garfield's gotten a lot bigger, or telephones have gotten a lot smaller since 1980.