Right after the very first sequence of the movie, everyone gets enough to eat for breakfast except Grug. The upset look on his family's faces is bad enough, but then he smiles the genuine Team Dad smile of heart-wrench-heart-melt and says it's alright- he ate last week.
Eep's wide-eyed fascination with wind-blown cinders, drifting and glowing in the darkness. The moreso if you consider it's possibly the first time in her life she's had the chance to savor the sight of something beautiful.
Grug and Guy coming to a mutual understanding while trapped in tar, then helping each other get out. Their method of escape would be best put under Funny moments.
After being manhandled within an inch of his life, Guy finally escapes the Croods! But while he is hiding, he catches a glimpse of the family looking for him. Eep stares after the spot where he disappeared, looking hopeful and confused. With a sigh, Guy returns and pretends he just went away to find materials to make shoes.
Picture it: Grug and Eep are at the edge of the cliff, with the world collapsing behind them. Right before Grug gets ready to throw her across the chasm, he pulls her in for a hug. It just goes to show, despite the bickering they've done throughout the film, there remains that bond between father and daughter.
Not to mention Ugga and Grug touching foreheads before he throws his mate across, because there's no words that can express what they're both giving up to ensure their children will live and have a mother's guidance. Who says this movie can't have romance that isn't about Eep and Guy?
Gran: You've surprised me today.
Anytime Gran shows she doesn't hate Grug as much as she acts, which is more often than you might think. After the first hunt, when the entire family is sad about Grug not getting to eat, Gran has a sort of resigned irritation on her face, like she's not happy about it but can't find someone to blame. Later, when Grug voluntarily sacrifices himself to save the others by throwing them across the chasm, Gran has the same alarmed look on her face as Ugga—she doesn't want her family to lose their protector.
When Ugga tells Guy that she knows how difficult it must be for him to travel with them, and thanks him for helping them have "the best day of our lives." It's an extremely sweet, maternal moment from her, especially for Guy, who has been on his own from such a young age.
After Grug and Guy have escaped from the tar and Chunky is about to attack them, Grug can be seen trying to shove Guy behind him the same way we've seen him do to his family.
Grug going from giving up, to The Determinator, the instant he hears the horn call.
Grug going back to save Douglas and other critters from the eruption.
Grug: Douglas? Hey I know that guy!
"I love you too."
The first night after the family loses the cave, Grug tells a story about why Eep's curiousity is bad. Guy, who is not part of the group yet, offers a story of his own: Once upon a time, there was a girl who kept getting too close to the edge of a cliff. Her parents warned her it was dangerous, but she wanted to follow the sun. One day she got too close to the edge of the cliff, fell off...and FLEW. The hope and happiness on Eep's face is heartbreaking and wonderful, and it becomes a huge transitional moment for the whole family...except Grug, who points out that they don't know how to fly.
Of course, later Grug is the one who helps Eep to fly: by using his strength to hurl her from the cliff across the lava pit that is obstructing their way to the other side.
And then LATER, Grug figures out a very...interesting way of flying. From a distance, it looks as though he is riding the sun.
When Grug raises his hand to "touch the light", showing that he finally understands Eep and Guy's desire for a new life.
After making it across the chasm, Eep won't stop blowing her shell to call to Grug. Behind her, the others try to figure out how to get her to give up. Gran volunteers...but after looking into her granddaughter's eyes, takes up her own shell and starts blowing out the call as well. Soon everyone joins in: they want to know that Grug is safe, and they want Grug to know that they love him and are looking for him.
Out of all the group, excluding Guy whom she didn't know about, she was the only one who'd lost her parents, and knew what Eep was going through. This make's Gran's volunteer, and her actions afterward, all the more heartwarming.
The moment Grug, left behind and facing certain death, finds himself face to face with Chunky, the huge saber tooth tiger chasing his family for much of the trek, and finding he's a friendly fellow who somehow knows that they need each other to survive this mess. After they manage to get to safety, Chunky becomes Grug's mount, eager to explore the new land with him.
Grug: "Turns out, I'm a cat person."
"1, 2..., 3..., 4, 5, 6. And 7."
And a half...sigh...8...*facepalms* 9...
Belt and Sandy saying "Dun dun duuuuuuun" together...and then hugging.
Grug's cave painting after being seperated from the rest of the family at the chasm, though it doubles very heavily as a Tear Jerker.
Not only does Grug include Guy in the painting, but envisions him holding hands with Eep. Not only has he accepted Guy into his family, but he has fully accepted his relationship with his daughter. That's about as heartwarming as you can get for an Overprotective Dad.
Combines as Tear Jerker. Remember when Guy and Grug were stuck in tar? Belt wasn't. Yet he clinged to Guy's waist, with every intention of going down with him.
We never see them, but the last thing Guy's family says to him before they died was "don't hide".
Grug seems to have taken that story to heart, with his own parting words to his daughter.
When Guy first encounters Eep's family, his first instinct is to protect her.
Basically, everything about Guy and Eep's relationship. Despite Guy's initial apprehension upon first meeting Eep and her family, Guy genuinely grows to love Eep.
Special highlights include Guy throwing flowers for her, the Umbrella of Togetherness and that heart-melting look they share during his story of tomorrow. You just want them to go and make cave-babies, they're so adorable.
It's a small moment, but the night that the Croods eat the roasted bird, there's a short period where you see all of them gorging themselves on the meat, fighting each other for the best pieces, and generally showing how they're not really used to having enough to eat. But throughout that entire sequence, not once do you see Grug fighting with his family over any food. Instead, he's sitting off to the side with a (relatively) small amount of the meat. Even though we know for a fact that Grug has eaten the least among them recently, he's still waiting until all of the others are satisfied before he tries to eat his fill.
It's a given that, like the rest of his family, Grug likely is terrified of the dark and the night (because of all the dangerous predators). When he wakes up and Eep is missing, he calmly informs Ugga of the situation. He then, with barely any hesitation, leaves the cave to look for Eep. Given how much he empasizes that you should never go outside at night, it's a testament to how much he loves Eep that he's willing to leave his cave in the dark for her.
Grug and the Sabercat are racing against time to escape The End, barely getting out with destruction at their heels. So what happens when he spots small, terrified, trembling animals as they get away? Every time, EVERY TIME, he forsakes the threat of death and jumps off of the flying contraption to grab the poor creatures and toss them onto the contraption so that they can escape too. And all of them, including the Saber Cat, become the family pets.
The adorable, pleading look on Chunky the Death Cat's face when he and Grug jointly blow on the torch to re-light it. Pleading, as in "Truce, truce, okay, just please don't let the dark come back!"