Visible crew/equipment: The girls jump off the house boat, leaving Max and Sam on board, as Sam tries to jump off Max grabs him, there are apparently sprays of river water but the hose creating the effect is visible.
Continuity mistake: After Max Cady killed Kersek and Sam Bowden finds his corpse in the kitchen, the blood pool changes shape in two different cuts.
Answer: As I remember it, Sam Bowden, Max's lawyer, knew his client was a rapist. He did not want Max to go free, so he buried the evidence that could have exonerated him. At that time, Max was illiterate, and Bowden assumed he'd never know about the hidden information. While in prison, Max, who was actually highly intelligent, learned how to read and also studied law. He later mounted his own unsuccessful appeals, which presumably gave him access to all previous evidence.
raywest