* JerkassWoobie: Grettir himself. He brings an awful lot of trouble on himself, but the reader really feels sorry for him.
* OlderThanTheyThink: 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.
* RomanticPlotTumor: The love story of Thorstein and Spes is a closed story arc in itself and has no relevance to the main plot at all.