2- Scrapjack has a propensity for swearing, especially when she's angry.
3- Teen-aged Rot surprises Jack while she's having a little sunbath. Before they started living and traveling together they'd only see each other at school and when they hung out at each others' houses, so it was always a treat for Jack to see her buddy.
4- A little peek at Rotgut's eyes! Eye contact is considered rude in yak culture, so most yaks just let their hair grow over their eyes. Scrapjack occasionally pushes up Rot's bangs to get a look at those pretty peepers— she's one of very few to see them and live. Rot also has a little beauty mark that Jack loves to tease her about.