When the family is mediating with Cleveland on whether or not to get back with Loretta, Peter accuses Brian of pushing Cleveland back with Loretta just so he himself could have Carolyn, and Peter says, "You know, Brian, sometimes I don't believe I know you," in a low and harsh tone; this is a quote from The Sound of Music, where Captain Von Trapp utters the same thing to Max Detweiler in response to his indifference to the Nazi invasion of Austria.
mentioned in dialogue
At the costume party, Brian asks a woman if she's dressed up as one of Freddy Krueger's victims.
Peter calls his bosses the "7 Dwarfs", just as Dr. Wigand calls the CEO's of Brown & Williamson, where he used to work.
Quagmire suggests a porn title of Vanilla boobs.
Quagmire dresses up as Napoleon for the costume party.
Brian meets his girlfriend while buying a copy of Richard Dawkins' "The God Delusion"
The popular conversation between Stewie and Brian which draws attention to a hard "h" consonant sound is directly sourced from dialogue within Hot Rod.
Stewie finds a book called "Horton Hears Domestic Violence in the Next Apartment and Doesn't Call 911".
When Lois asks Brian if he really thinks Loretta is beautiful, Brian replies "Absolutely!" and then goes into a lie-filled speech which is almost the same speech that Dr. Rumack gives to the passengers in the movie, and his nose grows longer and longer just as Rumack's nose did.