Plot hole: When the first police car arrives at the observatory, the policeman there tells them that the kid (Plato) holed up in the observatory has a gun and had "wounded a kid earlier." However, when that same policeman arrived at the mansion, he and his partner only ran into Plato and then followed him to the observatory. He had absolutely no way of knowing what had happened at the mansion prior to them getting there, which is when Plato shot one of Buzz's buddies.
Plot hole: After the secret passage has collapsed, the Black Fox hires Hawkin's midget acrobat friends because the only opening left "is barely (wide) enough for a child". Yet, during the throne room brawl, Hawkins passes the swing-around rope to a guy who is much taller than the midgets.