3. Agents Of S.H.I.E.L.D Cameos
This will be the most S.H.I.E.L.D-heavy Marvel cinematic universe movie to date, so it wouldn't really make sense to not at least catch a glimpse of some of S.H.I.E.L.D's finest - the cast of Marvel cinematic universe spin-off television series, Agents of S.H.I.E.L.D. Phil Coulson's first movie appearance since his "death" in The Avengers would be a welcome sight (we'd finally truly believe he really was back!), while seeing the likes of Skye, Jemma Simmons, Leo Fitz, Grant Ward or Melinda May in a movie for the first time would also be very cool. Essentially, there can't be a full television series depicting one of S.H.I.E.L.D's top guys (Coulson) and his team and then a very S.H.I.E.L.D-heavy movie that completely misses all of them out.