Friso94

Continuity mistake: When Toothless flies away with Astrid and Hiccup for the first time, he plunges into the sea completely multiple times but none of them are wet afterwards.

Friso94

Continuity mistake: When Hiccup first finds Toothless, there is a dramatic shot where the camera pans over Toothless, and his wing briefly obscures his eye, which is open after the wing passes. But look at the tip of the wing. During the shot there is a stretch of rope wrapped around it. In the next shot, the rope is much higher up the wing and not wrapped around it anymore. (00:13:15)

Friso94