I was actually just thinking about the opening credits today. They are amazing opening credits. Watch it again:
Right off the bat, you are shown exactly what you're getting into. Fast music, quick cuts. Lots of energy. The camera trucks out long past the established space of the living room, transporting you right off the bat from the mostly real world the movie start in, into the fantasy realm it actually takes place in for the rest of the film. And if you watch carefully, the symbols that appear with each actor in those manic flashes of just a few frames each are symbolic of the character they play.
Scott Pilgrim- Bass strings, very simple audio waves, playing on only one string at a time
Ramona- Changes colour from pink to blue to green (the three hair colours she sports through the film)
Wallace- Cellphone battery depleting
Lucas Lee- skateboard, Xs, and his skate company's logo
Stacey Pilgrim- coffee stains
Envy Adams- a broken heart and complex audio waveforms
Kim Pine- 1,2,3,4! and the Sex Bob-omb bomb
Julie- Black censor bars
Todd- a bass guitar and Xs
Gideon- Slashes, glasses, and the G-Man logo (made up of 7s)
Young Neil- Three blank comic panels (The shirt he wears for many scenes in the film, it represents the idea that young Neil's story remains untold all throughout the comic/movie)
Stephen Stills- Acoustic Guitar and plaid pattern
Roxy- 4 Xs (She's the 4th evil ex)
Knives- two sais
Mathew Pattel and the Katanagi twins- more Xs
AND, The animation style used- directly painting on and scratching into bleached 35mm film, is a nod to National Film Board of Canada animator Norman McClaren , which establishes Canada (atleast for any film or animation buffs)
Basically, best opening title sequence ever, and I love this freaking movie.