Panel One: Direct address much, cat who is supposedly thinking? If that's not Garfield's sign, whose is it? Someone else in the neighborhood has a nasty cat that is worse than Garfield?
Panel Two: I will buy the excuse that Garfield almost always takes place on a straight line before a blank background, because of Jon's Spartan interior decoration. But this strip must take place in an open field.
a. "Intimidation by association" isn't really far enough in meaning from "guilt by association" to be a "pun" or a "parody."
b. Garfield promptly does physically threaten someone, and has a 30-year history of prior assaults. It is less intimidation by association than "intimidation by intimidation."
c. That man is only a head taller than a cat.
d. Robert Crumb cameo?