Revealing mistake: When the apes jump out of the lab windows out to the street, they don't cast a shadow on any of the glass except the ones on the ground floor.
Revealing mistake: When Will's dad's Alzheimer boosts and he smashes the car driving in reverse, the headlight of the car behind is blatantly loose to increase the drama of the crash.
Chosen answer: Rodney was against the cruelty that fellow ape-keeper Dodge displays toward the apes and was likely hesitant to shoot Caeser at first. When Caesar yelled "No!", Rodney lowered his rifle from shock. Caesar then starts running around chanting "No!", and because he's running around Rodney no longer has a clear shot, and then he panics and flees having just seen an ape speak.
EK8829