New York’s real heroes
The audience and movie reviewers had critiqued the first Avengers movie for its lack of casualties while battling in New York. Though this might sound sort of gruesome, this apparently left an impression on the following movie’s producers. To show that there were real consequences, and in an attempt to satisfy astute viewers, they added a memorial statue in the background in Avengers: Age of Ultron.
They replaced the iconic Grand Central Station clock with a statue of 9/11’s first responders. The original clock was obliterated in the first Avengers Movie in the ensuing battle.