Other mistake: The television that Lau used to communicate with the crime lords was a regular set carried in by Lau's operatives and placed on the table (which didn't have a mic or camera on it), and there were no cameras in the room. So how was Lau able to see/hear/interact with the crime lords? (00:23:10)
Suggested correction: Lau doesn't need to see the occupants of the room in order to talk to them - he just needs to be able to hear them, so the fact that there are no cameras in the room is irrelevant. The microphone doesn't have to be attached to the television, it could be anywhere in the room, including under the table.
Other mistake: Whenever a character shoots a shotgun in the air inside, there isn't any debris from the shot. It happens when Joker crashes the fund raising party and when guards try to control the prisoners on the ship. (00:47:00)
Other mistake: During the Prewitt building siege near the end of the movie, three SWAT members are rappelling though glass windows to challenge some hostages who are dressed as clowns. Batman runs towards them and on screen just in time mid sentence to defeat two of the SWAT members with the third member already inexplicably writhing on the floor in the background, as though he has already been downed by the Caped Crusader before confronting the other two. (02:07:05)
