Character mistake: The animal control officer tells Kolchak he was crazy shooting off a flash bulb at the gorilla, but the first frontal shot Kolchak took of the gorilla did not flash at all.
Character mistake: Levitt is often seen wearing a cap device as a shield (badge). This is a big no in the NYPD.
Character mistake: James mentioned to Florida that he always knew his father was alive (after claiming to Florida he was dead in the past). But since James hasn't seen or heard from him in 35 years, there would really be no way for James to know that his father was still alive for sure - more like just a guess than certainty.