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Corrected entry: 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.

MovieFan612 ★

Corrected entry: When Toothless first brings Hiccup and Astrid to the dragon's nest, it is nighttime. About a minute later, when they leave the nest, we can tell that it is daytime. The camera cuts to them back at Berk, and it is nighttime again. (00:57:15 - 00:58:45)