This font looks so simple, yet I don't know it's name. Here's a massive range of words, all in different sizes, and some in bold, some not. They're all the same font, does anyone know what it is? This is literally every instance of the font use I can find all pieced together into one big picture. Anyone know? Thanks in advance.

Helvetica Condensed  Suggested by nclm 
Swiss 721 Bold Condensed  Suggested by nclm 

Hi,
It looks mostly like some Helvetica Condensed, bold for the all-caps parts, normal or light for the lower-case text.
The two first lines are set in something else, maybe Avenir Condensed, I don't really know.

I love that Bryan Lee O'Malley posted this picture on his tumblr. Too bad he didn't clarify the font name. >_<

For the record, Bryan Lee O'Malley has now answered :

“The font for all the small captions in both the books & movie is Swiss 721 Bold Condensed. Sometimes in later books I used the regular weight and italics too.”

Swiss 721 just being the Bitstream's version of Helvetica.