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.
Like You Would Really Do It: Tali is at Sword Base when it comes under Covenant bombing shortly before Operation: Uppercut takes place, with the cast (especially Shepard) subsequently mourning her loss. Then spoiler: She greets Shepard at the conclusion of Chapter 19.