- Dean's talked to, what... five girls his own age and the most he's gotten is a kiss? I can buy that he's still incredibly sexually frustrated and incredibly awkward around girls. However, he made more relationship progress with the four armed girl in 3 months than he did with Triana in YEARS. Like, they had an actual date. I'd still call that growth.
- Dean also had that whole thing with the bed and the attic. He also basically called Rusty out on using the beds on his kids, despite knowing first hand what kind of person it would make. He's clearly ready for space of his own and wants to become his own man, so again... growth.
- Rusty had to come up with a solution to a problem that had taken a MASTER OF THE FIELD years to complete on his own, and had to do it in days. It's not surprising he couldn't do it in this case... and while I'd say Rusty has made great strides in actually getting out of his father's shadow, he still kinda sucks at all of this.
- Billy and Pete had a huge amount of growth this episode. They confronted their first villain, won, and decontaminated the whole area in time to give Jonas Jr. the shield. These guys are still amateurs in the hero/villain thing but they are WAY better super scientists that Rusty is.