The images seen after Brian passes his driver's test is 'Go, Dog. Go!' by P.D. Eastman.
In a Japanese looking house Carter mentions dirty underpants in a vending machine. In Japan Burusera shops and vending machines cater to a sexual fetish for used schoolgirl underwear and gym clothing. Having shops and vending machines as intermediaries is considered an improvement over the older custom of school girls personally selling their fragrant garments to older men.