When Samantha orders a pizza, the pizza guy asks if she wants a pizza with extra anchovies. This is a very subtle nod to the Patrick Dempsey comedy, Loverboy (1989). The extra anchovies reference in that film meant that the delivery boy would be delivering a lot more than pizzas.
Samantha's Sony Walkman was used in the film to fit the 80's nostalgia theme. Walkmans were audio cassette playing boxes, and their convenient and portable function made them really popular with young people in the 80's and even up until the early 2000's before MP3 players and iPod's became so mainstream.