* AlternativeCharacterInterpretation: 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-girlfriend' also be seen as TheWoobie, or the other guy to also be a NiceGuy.
* DancingBear: This movie sets itself apart from the onslaught of Apatow-esque comedies that came out at the time with one basic gimmick: Jason Segel's penis.
* DracoInLeatherPants: 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 Creator/KristenBell.
* EnsembleDarkhorse: Aldous Snow was so popular that he got [[Film/GetHimToTheGreek his own spin-off movie]].
* HilariousInHindsight: Among a few other references, Jason Segel drunkenly sings the ''Series/TheMuppetShow'''s theme song. He would later star in and write ''Film/TheMuppets2011''.
* MemeticMutation: "I'll just go fuck myself"
* SignatureScene: Jason Segel's full-frontal moment.
* {{Wangst}}: Peter's moping over Sarah swings between funny and annoying depending on each scene. Fortunatley plenty of characters tell him to get over it, including Peter himself.
* TheWoobie:
** Sarah has bits of this. [[spoiler: She had her show cancelled while on vacation and it's clear to even her that she has no future in film. She finds out that she's dating the wrong kind of guy, which leads to getting jealous of Peter [[FromBadToWorse which leads to getting chewed out by both Aldous AND Peter]], etc.]] [[AlternativeCharacterInterpretation Depending on how you see her,]] this could be seen as karmic justice, or that she makes really bad choices (which, considering her career choices...).
** Peter starts out as this. He just can't get over Sarah and goes to Hawaii to try and forget her only to find her staying at the same hotel. He gets better, though.
** Even Rachel has a moment when Peter confesses he tried to sleep with Sarah again. A lot of tourists probably try to use her as a vacation fling, and at that point, it looks as though Peter was doing just that.

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