Continuity mistake: During Stoick's funeral Hiccup first shoots an arrow towards the ship and then the other characters draw their bows. Gobber is not shown as he is further away. In the next shot where they shoot their arrows, Valka and Eret are suddenly further apart from each other and Gobber has moved closer in between them. Eight arrows are shot simultaneously, but only seven arrows rain down.
Continuity mistake: In the film Hiccup has a scar on his face which is made out to have been there since he was a little boy. But if you watch the first movie, he only has a faint mark in some scenes, such as the scene after when he was looking out the blacksmith window gazing at Astrid.
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