When Spencer walks in and meets the young lawyer, he introduces himself as Beckett. Spencer asks "Sam, or Sir Thomas". Sam Beckett was the main character in Quantum Leap, created by Troian Bellisario's father, Donald P. Bellisario.
Aria and Jake see a trailer for Insidious: Chapter 2 on TV. Jake mentions that it's coming out in a couple weeks. Insidious: Chapter 2 came out in 2013, not 2012 while the liars were still in high school. However the episode aired in July of 2013 while Insidious: Chapter 2 came out September 2013.