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.
For the TV show:
Crazy Awesome: If Britten is only imagining one reality, then his hallucinations do aid him in solving cases in both worlds.
Tear Jerker: Britten saying goodbye to Hannah and the red reality in the finale.