The "distorted loon sound" is Emile Haynie's signature sound. This "loon sound" is present somewhere in Adele's Hello as he was involved in the additional production and extra instrumentation aside from Greg Kurstin, its main producer. Upon listening, Did you caught & hear the iconic loon call? YES or NO
To be honest, I didnt hear it unnoticed until I bought the album and seeing its track credits...to see Emile's involvement, and upon then I re-listened and I was surprised
if you mean the coldplay/explosions in the sky-ish guitar shrills right before the 2nd chorus, i noticed it upon first listen, i love that sound. i'd say u can hear it in WWWY too.
but i wouldn't say it sounds like a loon tho:
probably the most beautiful sound there is in nature, experienced it myself like this