MCU

**VIDEO** Callbacks in ‘Avengers: Endgame’
**VIDEO** Callbacks in ‘Avengers: Endgame’
**VIDEO** Callbacks in ‘Avengers: Endgame’
The MCU has done a fantastic job of intertwining all their movies, including callbacks that, if you miss won't ruin the movie, but can add a whole new level for the true fan out there. Here are some things that were called back to in Avengers: Endgame.