Captain America: Civil War

The day before filming a fight scene with Robert Downey Jr., Sebastian Stan sent him a video of himself doing intense bicep curls in front of the decapitated head of an Iron Man suit. He attached the message, "Looking forward to our scene tomorrow Robert."

The sleeve patches on the Russian soldiers in the beginning showing the flag of the modern day Russian Federation. The scene took place on 16 December 1991, the USSR was still in existence (though only for another 10 days). The soldiers would have had a red hammer and sickle on their patches instead.

SPOILER: There are two scenes in the closing credits:

• Bucky and Steve hide out in Wakanda, under the permission and assistance of King T'Challa. This leads into Black Panther (2018).
• Peter Parker awkwardly explains his injuries to Aunt May, and later sees a gadget Tony Stark made for him. This leads into Spider-Man: Homecoming (2017).

Edited from Ant-Man (2015)