As Downey Jr. arrives to unveil all of the cast’s chairs in one empty studio, there’s a strategically placed sign on the wall. Hovering over Quinn’s chair is a sign that reads “Fire Perimeter: Keep Clear.”

Avengers Doomsday cast announcement has an Easter egg about Fantastic Four's Johnny Storm that many have missed.

After a five-and-a-half-hour livestream that revealed Chris Hemsworth, Ian McKellen, Channing Tatum, and more would be in the movie via set chairs, the Iron Man star strolled into frame and sat on his own. He then looked over his right shoulder, put a finger to his lips, and shushed everyone tuning in.