Continuity mistake: When Nygma examines the corpse, he pushes his right hand deep into the body. When he is caught, he holds both hands up in the air. The glove on his right hand is completely clean, when it should be covered in blood and gore.
Gordon's apartment has a clock design on a window in his apartment. In the comics, his daughter, Barbara, used a clock tower as her base of operations as the crime fighter and information broker, Oracle.