Avengers: Endgame is full of cameos. You just have to be observant to realize who is who in Marvel's mega-productions. Making a cameo is not as easy as it seems, because the shooting schedule must coincide with that of the guest.
And this brings us to the most difficult cameo in Avengers: Endgame. Co-director Anthony Russo revealed that the most complicated cameo was that of the children who take a photo with Smart Hulk in a restaurant. The reason? Schoolwork.
"The most difficult was a scene in the restaurant where we introduced Smart Hulk. He is sitting there with Ant-Man, Black Widow, and Captain America, and there are these three kids who are fans of Hulk. They want a photo with him. Those three kids are: my son Julian, my niece Lia, and my nephew Augie," Anthony Russo told the Cleveland newspaper.
Later on, the filmmaker of Avengers: Endgame explains that scheduling the meeting of the minors on set for the cameo was difficult because of the children's school calendars. Even for the highest-grossing film in history! Anthony Russo knows how to divide his responsibilities so that his children fulfill their schooling.