10) Yondu’s Fin
In Vol. 2., Yondu has his head fin destroyed after Nebula shoots it off. It’s revealed that this is a cybernetic implant and the controlling mechanism for his whistle-activated Yaka Arrow. Handily for him, Yondu has a prototype replacement spare, which is much larger and a brighter shade of red.
For those who didn’t pick up on it, this is a reference to the character’s head fin in the comics. Though he isn’t connected to the modern version of the team that the movies are based off, Yondu was a founding member of the original Guardians of the Galaxy who were created back in 1969. In those stories, his fin is biological rather than a technological headpiece.
Vol. 2 gets even deeper into obscure Marvel continuity elsewhere in the movie, too, as the film travels to the planets Contraxia and Berhert during its run, both of which hail from the comics. Contraxia is the home planet of the mother of half-alien hero Jack of Hearts. Berhert, meanwhile, played a major role in a 60s Incredible Hulk story where Bruce Banner freed the indigenous Sagittarians from the evil Galaxy Master.