During the Credits
There is an extra scene midway through the credits of Justice League.
In the first extra scene, Barry Allen (The Flash) and Clarke Kent (Superman) are shown debating who can reach the Pacific Ocean first. Superman jokes that if he wins, then The Flash is off the team. Bruce Wayne (Batman) tells Barry that he has to take everyone to brunch if he loses the race. But if Barry wins, then he gets to tell everyone that he’s faster than Superman. The scene ends with Barry lighting a firecracker and the two racing as the scene freezes on them in action.
After the Credits
There is a stinger after the credits of Justice League that teases certain characters forming their own new team.
In the post-credits scene, Lex Luther is shown to have broken out of prison and celebrating the return of Superman on his yatch. Slade Wilson (Deathstroke) is shown boarding the boat where Lex tells him that they should make their own team to combat the Justice League.
Special thanks to Orlando Chaves, Ryan Morrison, Choon, Saran Srimee, 린다 愛してる, Chao-Yann Lam, and Erwin Kiekens for the stinger submissions!