Section 3 Question creator

In this section of the Hobbit there are a few things That are debatable. Here are a few, 1. Raven hill is mentioned way earlier in the the section then when they take refuge in it, what happened to their memory? 2.Why do the lake men have pickaxes when they live on a lake and don't need them? 3. If Dragon scales can deflect swords and break arrows then how come Smaug's belly is jewel encrusted from lying on his horde. 4. If Smaug weak spot on his belly was so easily hit by a single arrow then how come he wasn't killed when he first attached the town of Dale while  men were defending it. 5. Why dose Thorin not agree to help the lake men in some way after their town was destroyed. Well these are just a few debatable topics and I'm sure their are plenty more.