When we ran our Sprockets preview last week, we tried to give the piece a theme, and we couldn’t stick to it. In all honesty, we probably overstretched ourselves in trying to give a post on a children’s film festival a theme any grander than "children’s films," and when you get down to it, why bother? Trying to theme our introductory post to this year’s Hot Docs coverage, which will continue throughout the week,......