Nice! Glad you dug Truffaut's first. Like the ending. You might really enjoy comparing it to Jean Vigo's "Zero de Conduite"(?sp?) or "Zero for Conduct,"a pre-war film that's only 45-50 minutes long. A very similar work, but much more whimsical/magical, less "social realism".
I will look up Zero for Conduct. Sounds good. The 400 Blows had great location work. I guess they worked with cameras mounted on flatbed trucks. Very in and out. But actually feeling very locked down and stable.