When Shahenshah lifts one of the goons above his head during his fight in Gafoor Basti, the wire lifting the goon into the air is clearly visible.
During the song "Jaane Do Jaane Do" when Amitabh and Meenakshi are in the middle of the lake, it is obvious that he is wearing a life jacket under his shirt. That is why he looks "puffed up" and his shirt is buttoned up. As soon as the two are back on land, his shirt is open and the life jacket has vanished.
In the song Hey You, Vijay Srivastav pours his glass of alcohol in one of the musician's pocket. Then afterwards he was offered another glass and pours the same to that person's same pocket, which was shown dry even after a glass was already poured before.
In last scenes, a skateboard was clearly visible, placed beneath J.K, when Shahenshah was dragging him back to court room.
After the court acquits J.K., he leaves the courtroom, bids farewell to his friends, gets in his car and drives a short distance before coming face to face with Shahenshah, who then beats up all of J.K.'s goons and drags him back to the court. During all this time, all the people who were in the court during the trial (including the lawyers, witnesses, policemen and judge) are still there, even though the court had already been adjourned quite some time ago.
During the court scene when Amitabh Bachchan (as Shahenshah) dragged Amrish Puri back into the court room, he tells the judge how he didn't even listen to Julie's (Aruna Irani) statement. He then played the audio cassette where Amrish Puri and Prem Chopra are planning the bank robbery. This is the same cassette which Aruna Irani was to hand Kader Khan before she set him up. How Amitabh came across it was never disclosed. Especially when he just found out (before his Shahenshah appearance) that Amrish Puri was the man responsible for his father's suicide.