When Charlie Caldwell is on the stand being questioned, the defense lawyer makes a comment about not needing a license to shoot off your mouth. The people in the courtroom are shown and one sitting near the back is Charlie, who is still on the witness stand.
During the trial, the pliers that were used as evidence, do not have a spring mechanism. They are a simple parallel mechanism that is manipulated by hand, not by spring retraction. So, there could be no broken spring. The pliers are made by Sargent of New Haven Conn.
When Pike deals out Maverick solitaire for the second time, his shirt cuffs have changed. It appears that they used a professional dealer. When they cut back to the view of the whole room, his cuffs have changed back.