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According to Chris Priestly, Tali'Zorah nar Rayya was almost not included in the game as a full squadmate. Writer Patrick Weekes was able to persuade the development team to include her in the game as a full squadmate.
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In 2021, former Bioware cinematic designer Richard Boisvert posted an easter egg to Reddit that he believed had never been found before. In the Mars mission, if Commander Shepherd walks a specific route through the solar panels at the start, a Mars rover will roll up to Shepherd and nod.
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The pilot, Joker, references the book and film The Hunt For Red October by saying, "Stealth drive engaged. Only way they'll detect us is if you all start singing the Russian national anthem." In the book and film, the eponymous submarine, thought completely undetectable by traditional means, is discovered by American sub sonar when its crew joyously sings the Russian national anthem.
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Should Ashley have survived Virmire in the first game, after the "Shut down the Geth server" mission, the player can find a hungover Ashley lying on the floor after a night of hard drinking.
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If Wreav is the Urdnot leader during the mission Priority: Tuchanka, he will urge Shepard to "fight like a Krogan". This is a reference to the chorus of the Mass Effect fan song 'Commander Shepard'.
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