During the test where Chuck is shown a series of images, he mentions an "Oceanic flight" that was shot down. "Oceanic" is the name given to many ill-fated fictional airlines, and has been used in films like "Executive Decision" and TV shows like "Lost". See more...
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Continuity: In the series finale "Chuck versus the Good-Bye", Chuck and Sarah are in the Wienerlicious waiting for Quin to show up, Sarah begins rearranging the cups. There are three stacks of cups, and after she has set the third stack down, the camera cuts and she is now just reaching for the third stack. (She moved the third stack twice.)