During the fight in the factory, John Walker fights with the shield at close range refusing to let go of the shield, instead preferring to use it as a blunt object. When Bucky catches the shield, the fight becomes a nearly beat-for-beat recreation of Bucky's Winter Soldier fight with Steve Rogers in Captain America: The Winter Soldier (2014).
After Sam brings his damaged Falcon wings to Joaquin Torres to repair, he tells Torres to keep them. In the comics, Torres became the new version of the Falcon.
The fight in the factory between Captain America (John Walker), Falcon and Bucky is a reverse of the final fight in Captain America: Civil War (2016) where Bucky and Captain America (Steve Rogers) fought Iron Man, a non-powered hero with tech. The shield drop at the end of the fight is also a call back to "Civil War" except now it's Sam taking the title instead of Steve laying it down. This fight is also loosely adapted from the comics "Captain America" (vol. 1) #350, where The Captain (Steve Rogers) had to fight Captain America (John Walker) to get him to lay down the shield.
The Sokovian memorial that Zemo stands looking at features the Sokovian flag, which was only ever seen in the background of Avengers: Age of Ultron (2015). The memorial also features a family, which is a nod to Zemo's family, the Maximoffs and all of the other families lost. The memorial is also made on the lip of a large crater made by Ultron.
Ayo tells Bucky that the Dora Milaje are taking Baron Zemo to the Raft, a water-based prison for super powered people that made its MCU debut in Captain America: Civil War (2016) where it was last seen being supervised by Thaddeus "Thunderbolt" Ross. In the comics, Ross created his own team of ex-criminals, the Thunderbolts, who were originally led by Baron Zemo.