Stupidity: Robin uses the high pressure water from the pump to neutralize the bear next to Batman (which is like 10 meters away from him and still the water jet is so strong that it pushes the 1000 pounds bear away and flips it on its back,), but does not use it to push away the other bear that is literally breathing on his face centimeters away from him. He has all the space and time to do that (especially after Batman's intervention). (00:50:30)
Stupidity: Just after the geckos have finished eating Josephine's children, Thang, Rose, Didi and Sal attempt to sneak away. They attempt to sneak away from the geckos by walking directly in front of them which results in the geckos spotting them. If they attempted to get away in literally any other direction, the geckos would not have seen them. (00:22:50)