Kaiji Tang voices a few different characters in Netflix's English dub; Halfdan and Atli in season 1 and then Fox and Drott the Bear-Killer in season 2.
Kyle Hebert went from voicing Ragnar in Netflix's season 1 dub to Gardar in the season 2 dub.
Channel Hop: Vinland Saga was originally published in the shonen magazine Weekly Shōnen Magazine, but was later moved to the seinen magazine Monthly Afternoon.
Creator-Preferred Adaptation: Makoto Yukimura has gone on record as saying that the anime smoothed out pacing issues present in the manga, that the anime staff understood the story better than he did, and recommended that people watch the anime before reading the manga.
Due to licensing reasons, the first season of the anime was dubbed twice in both English and French languages: at first, respectively Sentai Filmworks and Kaze announced regional releases of the anime dubbed in their respective languages. Suddenly the Japanese region of Netflix revealed through the credits that the service has been provided dubs in various languages, including those English and French, but recorded in different studios and with different casts. Netflix's English version was handled by VSI Los Angeles.
Continued with season 2. Both Netflix and Crunchyroll simulcast season 2, with Netflix continuing their dub while Crunchyroll's dub reused the Sentai cast.
Olmar went from being voiced by Anthony DiMascio to Ben Balmaceda in the Crunchyroll dub after allegations of abusive spousal behavior came out against DiMascio.
Ari was voiced by Billy Kametz in season 1 but is now voiced by Stephen Fu in season 2 due to the former's death.
Specific Trivia
Askeladd(en) is the main hero name in Scandinavian Folk Tales. He's the protagonist and/or male Cinderella (Askeladd meaning Ash Lad. The Other Wikican tell more about it.) But the Askeladd's friends in the folk tales are usually badasses.
In history, Thorfinn Karlsefni is a descendant of the legendary Ragnar Lothbrok, arguably the most famous Viking, through his paternal line and Ragnar's son Bjorn Ironside. Ragnar's other son, Sigurd Snake-in-the-Eye, settled down in Denmark and had descendants that eventually continued to King Sweyn Forkbeard and Canute. This means that albeit very distantly, Thorfinn and Canute are cousins!
.) But the Askeladd's friends in the folk tales are usually badasses.