Valkyrie and Brunnhilde

Thor: Ragnarok reveals that the Valkyrie are the Asgardian Special Forces. Odin sends them after Hela in the most exquisite flashback sequence of any Marvel movie.

This differs from the comics, in which the name Valkyrie is taken by Brunnhilde, an Asgardian chosen by Odin to lead the Valkyrior, a team tasked with bringing the souls of fallen heroes to Valhalla. So in the comics, they weren’t necessarily Odin’s Special Forces team.

So Thor: Ragnarok’s Valkyrie (Tessa Thompson) isn't the same character as the one in the comics, although Brunnhilde saves Thompson's character from Hela in the flashback sequence.

In the movie, Grandmaster refers to Valkyrie as Scrapper 142. This is no random number, since Valkyrie first appeared in Incredible Hulk #142 (Enchantress’ impersonation doesn’t count).