My fondest wish is that Gwyneth Paltrow is just trolling everyone. That she knew perfectly well she was in Spider-Man: Homecoming and she knew perfectly well Sebastian Stan plays Bucky and that Bucky first appeared in Captain America: The First Avenger, before continuing in Captain America: The Winter Soldier, Captain America: Civil War, Black Panther, Avengers: Infinity War, and Avengers: Endgame.
Article source: https://www.cinemablend.com/news/2474630/listen-to-chris-pratt-explain-to-gwyneth-paltrow-who-sebastian-stan-is-at-infinity-war-premiere