By proxy. In Office Christmas Party she's seen reading The Girl on the Train. Her husband Justin Theroux played Tom in the film adaptation of the book. The same film also has a line where her character is said to be "salad and Smart Water" - Jennifer is a spokeswoman for Smart Water in real life.
In the Friends episode with Monica and Chandler's wedding, Rachel finds a Greek Orthodox priest coming out of the Anastassakis/Papasifakis wedding. Anastassakis is her family's real last name.
Cake (2014) gives her a scar on her chin and another on her legs. She wears no make-up for most of the film, and is seen mostly in dressing gowns and pyjamas.
Casting Gag: Rachel's best friend Mindy, who stole her fiancee, is played by Jennifer Grey. Both actresses had played Jeannie Bueller - Grey in Ferris Bueller's Day Off and Aniston in the attempted spin-off TV series.
Hollywood Hype Machine: The book Desperate Networks (about how TV worked during the mid '90s through the 2000s) goes into some detail about how she was a "network darling", and the studio was actively looking to give her a break-out role. The Hype Machine got behind her big-time, showcasing her constantly in all forms of media. She is actually given far more mainstream press than her non-A-list movie career would warrant, except for the fact that she's wildly famous regardless of her films' success, and she sells magazines very well.
I Am Not Leonard Nimoy: Particularly in the 2000s where all her roles evoked the same public image of her as this fun-loving, fashionable party girl. She was even turned down for 24 because of this. But she did manage to avoid this in Horrible Bosses and Cake (2014).
Leprechaun. Jennifer recalls being proud of the film when she first got it - as it was her first studio picture and she was starring alongside Warwick Davis. Then she became famous for Friends and ashamed of it. She does poke fun at it though.
The famous Rachel hairdo she sported in the second season of Friends. She hated the cut, didn't understand the fascination with it and grew it back at once.
Throw It In!: The white dog in Joey and Chandler's apartment was a gift someone had bought her when she started acting. She brought it to the set for the day, and producers liked it so much they kept using it.