1. Martha Jones went to a Harry Potter release party with the Doctor, dressed as Angelina Johnson. She spent most of the night behing hit on by awkward teenagers in Hogwarts uniform while the Doctor argued over the allegiance of Snape with some little kids. She had to leave early when the Doctor got kicked out because he spoiled a seven-year-old and made her cry.
2. She goes into medicine because she likes helping people and fixing things. She thinks sometimes that's what attracted her to the Doctor, how badly he needed fixing, and it bothers her just a little that she had to leave the TARDIS before she could manage it.
3. Being stuck in 1969 is an unfortunate situation, she hates her job in a shop and she hates not knowing if she'll never get to go back home, but it's so much better than 1913 that she almost doesn't mind.
4. She never tells the Doctor how many people she meets during the Year That Wasn't who knew him. She sees then, though, how many people he's left -- and how many people have left him -- and that, more than anything else, gives her the strength to "get out".
5. She's not really all that attracted to Jack Harkness, truth be told; she can't help but think of the gigantic head from New Earth.