Financefag here. Been workfagging so I may have missed if this was covered.
Q talks about watching Goog 10K (basically a more detailed annual report) and 10Q's (quarterly statements). I would also recommend watching interim filings including 8K's (material information) which is filed on an as-needed basis;
Proxy statement (this will give detailed compensation on 5 top highest paid officers and also talks about their stock and options holdings), and Form 4 (anytime an insider buys, sells, acquires or disposes of equity he/she is supposed to file a Form 4). Insiders are not allowed to sell if they have material inside information–for example a director knows of plans for an acquisition or divestiture is not supposed to be able to trade stock until the public announcement or the filing of financial statements.
Now of course bad guys don't always follow the rules or they like to skate right on the edge. Keep an eye on the Form 4's and let's see who's selling.