These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Alternative Character Interpretation: As the movie develops, it allows room for some human shades of both Aldous Snow and Sarah, who were initially seen as antagonists from Peter's perspective. Not very many break-up movies let the 'bitchy ex-grifriend' to also be seen as The Woobie, or the other guy to also be a Nice Guy.
Draco in Leather Pants: Sarah Marshall, despite being portrayed as a selfish, petty and genuinely unpleasant individual, will still have audience members defend her to the death...presumably because she's played by the very attractive Kristen Bell. The Unfortunate Implications in her negative portrayal don't help matters.