User blog comment:Toothless99/Things I noticed/@comment-1662538-20101202195644

Film
In Dragon Training, Astrid and Hiccup are the only pupils without helmets. And then, when Hiccup gets one, Astrid is the only pupil without a helmet. Why doesn't she wear one? I would presume that people bring their own helmets, or something. So I would presume Astrid's parents can't be bothered to buy one (times are tough after all, with the recession...)

Hiccup states at the beginning of the film that only the best Vikings go after Monstrous Nightmares, so why do you have to kill one to become a true Viking? So that you prove yourself a best Viking?

No-one knows what a Night Fury looks like, but when they first see Toothless for real, they go 'Night Fury'. How do they know it's not a totally new breed? How do they know it's a Night Fury? A wizard did it.

The Vikings are unable to say "Night Fury!" without following it by "Get down!" You think the species was a 'Night Fury Get Down' I believe that's just their way of saying 'Get down!' when they see a Night Fury.

Books
There are no female hooligans known apart from Valhallarama, but to reproduce you need females and males, which means there must be female adults, and they need to grow up, so why are there no female children, or adults, in the hooligan tribe? Same with Bog-Burglars but vice-versa. Clearly, the Hairy Hooligans are very unlucky and somehow managed to produce a whole generation with no females. I would presume that the whole tribe will be gone next generation, and all will be in vain.

Or possibly there's interbreeding between the Bog-Burglars and Hooligans.