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Continuity
Stuart takes a picture of Leonard, and says he's going on the "Wall of Heroes" because he was the closest to ever get to picking up a girl at the comic book store. This is not true. Stuart picked up Penny during The Hofstadter Isotope (2009) in the comic book store.
Leonard tells Penny he can't drink wine because of sulfites, but he drinks wine in several episodes before and after this episode.
Stuart takes a picture of Leonard, and says he's going on the "Wall of Heroes" because he was the closest to ever get to picking up a girl at the comic book store. This is not true. Stuart picked up Penny during The Hofstadter Isotope (2009) in the comic book store.
Sheldon tells Leonard that Friedrich Nietzsche died of syphilis. In actuality, Friedrich Nietzsche died of pneumonia.
Sheldon says "They know how to settle scores in Texas. Just ask Mexico!" Technically, the USA stole Texas from Mexico, which makes Mexico the one with a score to settle. Addition: Texans typically consider Texas' independence, Republic formation, and eventual inclusion in the United States as recompense for the defeat at the Alamo.