In one of their pre-fight introductions, Captain Cold states his heart is frozen. Flash responds with "Let it go." He also says this to Mr. Freeze.
The game will introduce a loot-dropping system, known as the "Gear System", which provides character-specific costume pieces and equipment; players will be able to customize the look of their characters and upgrade their abilities, such as increasing their speed, strength, or health.
Ed Boon has confirmed that there will be more DLC characters from the last game Mortal Kombat X (2015).
In the Ace O'Clubs arena the civilians ignore the fighting. This is a call back to the comics in that when metahumans fought there, the patrons would purposely ignore the fight assuming the superhero would win.
Dee Bradley Baker was replaced by Jeffrey Combs as the voice of Brainiac in Injustice 2.