In Paradox, Praedyth mentions that Pahanin was always talking to himself. This is actually Pahanin talking to the Super Good Advice, a gun which in the lore could talk to its owner. Just a fun little touch I noticed.
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In the "Last Rites" mission (the stealth mission), if you go into the Crystal room in Crota's chamber, you can see Ir Yut (the old Deathsinger) floating around even though, presumably, we killed her months ago. Not sure if it was an easter egg or not but it was kinda funny seeing her just chillin when only months prior she wiped my fireteam countless times. It was almost nostalgic. [i]Almost[/i].