During the scene at the Yankees game, the song "Power of Love" by Huey Lewis & The News plays over the stadium intercom. It was also the theme song for Back to the Future (1985) which starred Zoey Deutch's mother Lea Thompson.
Lucy Liu and Taye Diggs also worked together in Chicago (2002) and in several episodes of Ally McBeal (1997).
The guy Harper plays miniature golf with (Jake Robinson) is never named, only referred to as "golf guy." Consequently, in the credits he is also listed as "golf guy."