Trivia: Spoilers! Red Skull makes his long-awaited return to the MCU after his appearance in Captain America: The First Avenger. We discover that he's been guarding the soul stone as punishment, of sorts. However he's played by Ross Marquand, not Hugo Weaving.
Trivia: While Bill Foster, played by Laurence Fishburne, is teaching the class, the words "Matrix" can be seen on the blackboard behind him, referring to the film series Laurence Fishburne starred in.