- Alternate Character Interpretation: Many viewers consider Professor Bomba to be a terrible parent who place more value on his obsession than on his wife and daughter. Then MK comes to accept that he was right, yet Bomba never learns a moral lesson about his neglectful behavior, making him appear all the more unpleasant.
- Base-Breaking Character: Mub and Grub are either really funny or really annoying to most people.
- Cliché Storm: In the words of reviewer Matt Zoller Seitz:
"There's a protagonist grieving over her mother's recent death, and a brilliant but scatterbrained father who loves his child but isn't the strong parental figure she desperately needs. There's a hidden world akin to Alice's Wonderland that the inquisitive heroine explores. There are beleaguered good guys that she joins in a war against bad guys that represent chaos and decay; their leader is a funny despot with a European accent. There's a mythology that will be fulfilled when good guys take a fragile pod on a journey toward a prophesied end. There's a young warrior with whom the heroine forms a flirtatious friendship. There's a tough older warrior who mentors the younger warrior. There are comic sidekicks, and a beautiful forest queen who utters platitudes about the cycles of life and then dies."
- Ensemble Darkhorse: Dagda, who has barely been seen in clips and trailers, already has a small female following on Tumblr.
- Evil Is Cool: Mandrake. Being an Affably Evil overlord who genuinely loves his son certainly helps.
- Ho Yay: Jokingly mentioned by MK in regards to Nod and Ronin, but it's obvious she's not the only one who caught it.
Plus some fans ship Ronin and Professor Bomba (calling them "Forest Dads"), despite a lack of interaction between them. Same goes for Mandrake and Ronin, though they share scenes together.
- One-Scene Wonder: Pitbull's character, Bufo, only appears in two scenes and was never mentioned or seen again. There is a bullfrog skeleton, labeled as Bufo Americanus in the Creative Closing Credits. Considering how we left Bufo (having accidentally insulted Mandrake's recently deceased son)...
- Paranoia Fuel: So, there's a race of little people that are experts at hiding. You're a renounced scientist, and you know they're there. But the little folk think you're stupid, and decide to play mind games with you, to the point where you're an obsessed wreck that's lost his job and his marriage, chasing after things that they know are real, and you know are real, but they won't let anybody else know are real.
- So Okay, It's Average: A criticism. It's a good film in its own right and is very beautifully animated, but it really doesn't showcase anything noteworthy that hasn't been seen in other stories that separates it from the pack.
- Special Effects Failure: The deer appears to have come from a different film altogether.
- Strangled by the Red String: MK and Nod fall in love very quickly.
- Ugly Cute: Ozzy's a pug. It's obligatory. Not just a pug but an old, half-blind, three-legged pug.
- WTH, Casting Agency?: So, there's Colin Farrell, Christoph Waltz, Amanda Seyfried, Josh Hutcherson, and... Pitbull?!