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.
YMMV: The Saga of Grettir the Strong
Jerkass Woobie: Grettir himself. He brings an awful lot of trouble on himself, but the reader really feels sorry for him.
Older Than They Think: When Thorbjorg the Stout finds Grettir captured by farmers and questions him, his response as to how he ended up there is essentially the punchline of the old "everybody gotta be someplace" gag.
Romantic Plot Tumor: The love story of Thorstein and Spes is a closed story arc in itself and has no relevance to the main plot at all.