The $2000 that Hazel Bascombe hands Amos is clearly not real American currency.
Several cuts to Amos Catledge listening to testimony in the courtroom are actually stills with some panning & zooming motion added to them to appear live-action.
When Bascombe is shot, the sheriff doesn't believe Perry's client because there are no ejected shells around where the body is found. Norton had told the sheriff that the cabin was being fired on. If Bascombe had used a revolver, there would be no expended shells, and if someone had removed the revolver, it would also explain why Bascombe's rifle hadn't been fired. The reverse is also true. If Norton had shot him twice with his rifle, the sheriff should have found the two expended shells. Neither scenario adds up without a third party being involved.
Police officers know that smart killers usually police their brass. The sheriff should have known that the absence of brass at the crime scene means nothing.