Acquired Situational Narcissism: When she thinks she's won Employee of the Month and it turns out, everyone just thinks she's dead. Happens again when she actually wins Employee of the Month.
All Women Love Shoes: Jen loves shoes so much it's literally all she says until she gets her hands on them, and when she does they literally mangle her feet, putting her in intense pain for the rest of the day.
Blatant Lies: Her Establishing Character Moment has her bluffing her way through a job interview with Denholm, even though she is totally clueless about computers and doesn't even pronounce it right! Jen even lampshades it! "I lie, I lie, and I lie! And then I lie some more!" In Season Three, she doesn't even know what IT stands for.
Team Mom: Best shown when Jen leaves to pursue another job interview, Moss singes his hair and loses his memory, while Roy becomes shirtless, homeless and forced to live in a box; all in the space of two hours!
I can't go to prison, Roy! They'll rape the flip out of me!
Spanner in the Works: He has a tendency to ruin Jen's dates, like tagging along with Phillip when he invited Jen to a musical, attending Peter's dinner party and pointing out his name sounds like "Pedophile", pointing out a guy Jen was dating looked like a magician, crashing Jen's date with Daniel, etc.
Metaphorgotten: "Well, I'm the boss. Head Honcho. El Numero Uno. Mr. Big. The Godfather. Lord of the Rings. The Bourne... Identity. Er... Taxi Driver. Jaws. I forgot the question quite a while back. Who are you, again?"