The first episode of any American animated series to mention CDs.
Jon says Garfield's temperature of 101 is a fever, Liz replies, "Nah, that's normal for Garfield". A cat's normal body temperature ranges between 100.5 and 102.5.
The Parrot voiced by Frank Welker who auditions for the Animal acts competition does impressions of Bill Cosby, Paul Reubens (as Pee Wee Herman), Jack Nicholson, Bob Hope, Clint Eastwood (as Dirty Harry), and Mr. T. He also did his own impression of Garfield which is the reason why Welker would later take over the voice of Garfield starting in 2007 and he can still voice the character even to this day.
The rule signs in Wade's song are "No hand ball", "No parking 10AM-6PM", a "No Smoking" symbol (which also appears as text seconds later), a stop sign, "Don't touch", "No talking", "Do not exceed speed limit", "Do not remove", "Do not enter", "Open", "No smoking", "Don't walk", "No swimming", a "Go" sign, "No Bills", "No Admittance", "No right turns", "No loitering", "No exit", "No yogurt", "Keep off the grass", "No checks cashed", and "No John Wayne impressions".