When Nick is at Meredith's apartment, on one of her strings, there is a picture of Hailey with ash on her forehead from her first day at her new school school. At this point in the show, Hailey was still at school and neither Nick or Meredith had seen her.
When Sonny is playing golf with his producer Kip, Kip mispronounces George Takei's name; it rhymes with "okay", not "goodbye".