The Slouch Hat. The slouch hat is an object strongly associated with Australian identity. Corporal Matthew Walshaw from 4th/3rd Royal New South Wales Regiment adjusts his slouch hat before moving off to form up at the Rocks in Sydney, NSW.
This is another episode when Brian's book was mentioned. Stewie's phone number is (401) 555-0183. 401 is the actual area code for the state of Rhode Island, where Family Guy is set. Afuera is Spanish for outside. Lois mentions animal rights group PETA when Brian is speaking to the Griffins about animals rights.
In the Dial S for Willie comic strip, SpongeBob's phone number is said to be 555-9196. This is a fake phone number because it lacks the amount of number digits in an actual phone number. It may have purposely been written like that to prevent people from actually trying to call SpongeBob SquarePants.