There is a mid credit scene folks.
Heads up as I'm sure some missed it.
Nothing too fancy just Henry Kessler (the black guy who told John about the doctor) in a trap, seemingly in the bathroom from the first movie, Detective Hoffman is in the scene alongside John, he's the one who helped John find Henry. Henry is in a trap that seems to have a claw like mechanism that will cut into his abdomen. Henry has no scar, he was in on the con the whole time. The rules of Kessler's 'game' aren't explained and no gore is shown. The scene serves as a tiny cameo for Hoffman more than anything else. Only last some 20-30 seconds I think.