Batman's shadow on the wall behind the Joker and his men shows him holding up his cape in his trademark pose to frighten of villains. However, Batman stopped striking that pose as he began to speak.
First Batman says that it's a school holiday, which refers to a weekday the school is let out. Then later in the same day he says it's Saturday.
There is a scene where several clocks are shown for different world cities. The time zone differences for the real US cities are reversed, as LA (5:40) is shown as 2 hours ahead of Chicago (3:40) instead of 2 hours behind. The time difference between Paris (8:40) and Chicago is off by 2 hours. The time difference between Paris and Tokyo (5:40) is off by 2 hours.
The Gotham City clock is set for 2:40, If the Los Angeles clock is correct, Gotham city is in Hawaii. If the Chicago clock is correct, Gotham City is in the Rocky Mountain time zone.
The Gotham City clock is set for 2:40, If the Los Angeles clock is correct, Gotham city is in Hawaii. If the Chicago clock is correct, Gotham City is in the Rocky Mountain time zone.
The Joker threatens to show the photograph of the basketball team holding the answer papers to the school board in order to get them suspended. However, when the photo was taken, the boy holding the papers was holding them with the (blank) back of the paper facing the camera.
When Dick Grayson sets the micro TV camera on the counter in the candy shop it is pointed straight at Susie. The two camera shots shown on the Bat-Mobile's Bat-Scope are both from different angles.
When Suzie sniffs her perfume, she passes out because she has just been poisoned. Yet even though she is unconscious and dying, she maintains her hold on the bottle and does not drop it.
Dick Grayson chokes on smoke that was never generated. When Nick provides a light, he hasn't got the match close enough to the cigarette to light it before Dick starts to cough.