This episode has some interesting legal points. The case cited on results of the paraffin test being inadmissible (Brooke v State of Colorado) is real, and was decided June 1, 1959, just months before this Mason episode first aired. Perry won the legal point. The now outdated concept of res gestae also appears.
Perry has to contend with a family patriarch who spends lots of money to hide some pertinent details, which details would help Paul.
The last few minutes of the episode are worth waiting for.