Gabriel Macht (Harvey Specter) and Sarah Rafferty (Donna Paulsen) are actually best friends in real life. They have known each other for almost 20 years and he is the one who suggested her for the role of Harvey's loyal and faithful assistant.
In two episodes, Sucker Punch (Season 2, Episode 7), Rewind (Season 2, Episode 8) and (Season 2, Episode 10), Jacinda Barrett made an appearance as Zoe Lawford. Barrett, in real life, is married to Gabriel Macht, who plays Harvey Specter.
The sharp suits worn by Harvey Specter are the "Windsor" model by American fashion designer Tom Ford. They are characterized by wide peak lapels and a British-style ticket pocket on the jacket. They also occasionally come with a vest/waistcoat to make a three-piece suit.
References to the TV show Game of Thrones (2011) are made in numerous episodes of Suits (2011). Michelle Fairley and Conleth Hill, who both had parts in Game of Thrones (2011), were guest stars in seasons 2 and 3 of Suits (2011).
The miniature bike Harvey has in his office is the Brough Superior SS100 (1932), made by Minichamps in 1:6 scale. This was the motorcycle T.E. Lawrence, also known as "Lawrence of Arabia," was riding when he was killed.
Both Vanessa Ray and Troian Bellisario have played love interests of Patrick J. Adams (Mike Ross). Although the actresses never shared any scenes on Suits (2011), they shared several scenes together on another show, Pretty Little Liars (2010). Adams, who is the real-life fiancé of Bellisario, also appeared on Pretty Little Liars (2010), but he shared no scenes with Bellisario nor Ray.
Amanda Schull(Katrina) was another actor to appear on both Pretty Little Liars (2010) and Suits (2011), along with Troian Bellisario, Vanessa Ray, and Patrick J. Adams. Apart from Adams, she did not share any scenes with Bellisario or Ray in either Suits (2011) nor Pretty Little Liars (2010).
Troian Bellisario (Claire), Amanda Schull (Katrina), Vanessa Ray (Jenny) and Andrea Parker (Tory), who have all played characters on this show also, all also appeared in the TV show Pretty Little Liars (2010).
The trivia items below may give away important plot points.
Louis discovers that Mike did not attend Harvard because he did not recognize Louis's Order of the Coif key. However, in real life, Harvard does not have a chapter in the Order of the Coif, so Louis could not have received this honor.