From The Perry Mason TV Show Book
Paul’s life is at stake in this one, so Perry puts up quite a fight to clear his friend from a murder charge. The situation: After putting the pressure on Frank Thatcher to confess to a hit and run accident, Paul dukes it out with him, is popped, goes down for the count, and wakes up to find Thatcher dead. Ham Burger is reluctant to prosecute, Tragg is suspicious, but a confident Perry Mason jokes with Paul that the only doubts he has concern Paul’s ability to pay his bill.
+Suggested Correction Perry's only doubt is what Paul will say when Paul sees Perry's bill.