These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
In the video for Borderlands, the guys make a siren-like sound ("wee-oo wee-oo!") when Lilith is introduced "as The Siren". When Angel is introduced a moment later they make the same sound for her. Three years later, Borderlands 2 confirmed that yes, Angel is a siren too.
"Funny Aneurysm" Moment: During the Atelier Rorona episode, the guys remark that Rorona must be a great Alchemist to work for Astrid, since she's clearly not in there for dealing with customers. The Episode was aired only a month after Atelier Meruru and Astrid's unsettling "treatment" towards Rorona.