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Quotes

Hiccup: Thank you for nothing, you useless reptile.

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Mistakes

When Hiccup draws Toothless in the glen for the first time, he smudges the left tail section, indicating his understanding of the problem of why Toothless can't fly. When we next see the drawing, at dinner that night, the left tail section is clear and unsmudged. (And later in the film, it's smudged again.) Even if the filmmakers "fixed" this error while still in theaters, the DVD version I have shows the original errors - smudge/no smudge/smudge. See more...

Trivia

Before Toothless brings Hiccup and Astrid to the dragon's nest, we get several shots of other dragons. Pay attention to one shot of a Monstrous Nightmare; it can be seen holding Gloria, the hippo from Madagascar. (Confirmed on the DVD's commentary.). See more...

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How to Train Your Dragon (2010) - 9 corrections

starring America Ferrera, Christopher Mintz-Plasse, Craig Ferguson, Gerard Butler, Jay Baruchel, Jonah Hill (add more)

Genres: Animation, Adventure, Comedy, Drama, Family, Fantasy

Comments made in brackets are corrections from other visitors. To submit your own corrections for mistakes, just click "edit" under an entry, then choose "correct entry". You can also submit corrections for corrections, if you think a mistake has been unfairly removed.

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When Hiccup is training toothless and becomes liked by the locals, when he sits down to eat in the mess hall there is an adult viking that runs to his table from the opposite side Hiccup is sitting on. He runs straight through the bench and then sits on it. [Not true. There is no bench, he does not sit down, but simply puts his arms on the table.]
Edit Time
When Hiccup draws Toothless in the glen for the first time, he smudges the left tail section, indicating his understanding of the problem of why Toothless can't fly. When we next see the drawing, at dinner that night, the left tail section is clear and unsmudged. (And later in the film, it's smudged again.). [This has been fixed. The tail IS smudged at the dinner scene.Apparently it was fixed whilst still in theaters.]
Edit Corrected by Moviegamer
During the first training sequence, Tuffnut and Ruffnut are fighting over a shield. After Ruffnut hits Tuffnut with the shield, she holds it in her hand, but in the next shot, they are both holding onto the shield. [On that scene, Ruffnut had always both hands on the shield.]
Edit
Near the beginning, when Hiccup says the other teens names, right before he says Astrid's name the area behind her explodes, but neither her skirt nor her hair move at all, indicating no wind pushing out from the explosion that happened right behind her. [This scene is a goofy homage to action films and the whole point is that Hiccup sees Astrid as a lovely beauty who creates a significant reaction in Hiccup - it's not about explosions and wind blowing her skirt.]
Edit Corrected by MovieFan612
Towards the end of the film, right after Hiccup and Toothless take down the giant dragon and everyone is gathering around Toothless, right after Toothless reveals that he saved Hiccup, a close-up shot of Astrid shows her bangs away from her eye, but in the next immediate shot, her bangs are suddenly in front of her eye. [Throughout the entire film, we see Astrid constantly moving her fringe away from her eyes and it immediately falls back down again (e.g., in the training arena the first time they enter it for training). This is a normal characteristic for Astrid.]
Edit Corrected by MovieFan612
When Hiccup is looking for the night fury, he says, "I manage to lose an entire dragon!" He hits a branch and it snaps back to hit him, after which you see the red mark, but seconds later it's completely gone. [It's a slight red slash to indicate the branch striking him but it would, of course, dissipate quickly. It's not a cut or a raised welt. This isn't a mistake.]
Edit Corrected by MovieFan612
Throughout the entire movie, none of the characters' breath forms steam. There are many things in the film that point out it's very cold (Stoik mentioning winter is almost here, they must be in the arctic circle because the Northern Lights are visible, etc.) If it was even fairly cold, breath would form a steam cloud in the air but, somehow, this never happens. [1) The Northern Lights are not just visible in the arctic circle. 2) Given what's seen of the current climatic conditions and the abundant vegetation, it seems clear that it's not that cold at that point.]
Edit
At the end of the film, just after the "queen" dragon is destroyed, Hiccup falls head-first, engulfed by the flames, but the injury he receives is losing his left leg. [We don't get to see the nature of his injuries or how he impacts the ground because he's wrapped in Toothless' wing. Toothless could have switched him to a heads-up orientation at the last second - shattering his leg, but saving his life.]
Edit Corrected by BocaDavie
When Astrid meets Toothless for the first time Hiccup says "She's a friend", referring to Toothless. It's established many times that Toothless is a "He". [Hiccup is talking to Toothless, referring to Astrid. He's trying to keep Toothless from attacking Astrid by telling him that she's a friend.]
Edit Corrected by BocaDavie