Not to mention it was awesome enough to get him a free upgrade to Leobreaker.
I know it's a little silly but, I liked it when Scourge first called Lori "Little Sister". It was just so cute!
When Leobreaker explained his backstory in "Honor" about when he was Overhaul back on Cybertron. How he used work alone and did enjoy praise it brought, until one day, he overheard some bots talking about how they didn't want to be partnered with him on a mission because of his apparent hot-dogging and lack of regard for others (which is ironically the exact opposite reason he wanted to work alone in the first place, he was just really Hot-Blooded when trying to protect others). Now working alone out of bitterness, Overhaul was later caught beneath a collapsing wall during a battle, and believed himself done for, until Optimus Prime suddenly arrived to rescue him. Turns out Optimus had always been there to watch his back, he was just modest enough to stay out of sight unless Overhaul was in a tight spot.
When the Autobots try to get the newly acquired Jungle Planet Key back home they come up with a clever scheme. Everyone of them will carry with them a box that may or may not hold the key inside. Then the'll all split-up to try and spread the Decepticon forces thin and make it back though the portal to Earth. Thing is, only Optimus knows who has the Key. In the end, it turns out he doesn't have it, Leobreaker does! A fact that surprised him just as much as anyone.
Even if their voices did sound a little... silly, I liked watching Menasor and Metroplex make up thanks in part to thier Mini-Con's in episode 45.
Coby and Lori's wedding, with Colonel Franklin and Lucy Suzuki attending, one of them holding what is presumably their infant child.
Also, earlier in episode 49:
Optimus Prime: Coby, you are far from home, and I should never have brought you with us...But I'm glad I did. You kids have meant so much to the team. A challenge at first, but so curious, so full of life, so ready for adventure. You were a constant reminder of just how important our mission was - and still is. I know we'd never have made it this far without you. I must go now, Coby.
After Primus turns back into the planet Cybertron again, the planet surface now sports a slightly more organic look. Almost as if it was Primus way of saying thank-you to the kids for helping to save everyone.