Recycled Script: Became somewhat common towards the end of the first series.
Role Ending Misdemeanor: Narrowly averted in the case of William Talman, the actor behind Hamilton Burger, who was arrested for misdemeanor offenses and (though cleared of the charges) subsequently fired by CBS. A campaign led by his co-stars eventually got him rehired.
Shout-Out: In its second season Lois and Clark featured a feisty woman attorney called Mayson Drake. In fact, the original script specified her name as Della Mayson Drake, and she was supposed to be Paul's daughter.
Invoked, almost in those very words, by punk musician/lecturer Jello Biafra in "Tales from the Trial", talking about his own obscenity trial in 1986. He even sings a few lines of "Park Avenue Beat".
Word of God: After Raymond Burr's death, it was revealed that Perry Mason author Erle Stanley Gardner himself had advocated Burr's hiring; neither he nor the producers were happy with the actors who had auditioned for the titular role (but were leaning towards Fred MacMurray). Burr, who had primarily played The Heavy in a series of low budget films, was invited to shoot a screen test for the role of Hamilton Burger. Midway through the playback of Burr's test days later, Gardner (who had never heard of Burr) stood up, pointed at the screen and said "That's him! That's Perry Mason!" The rest is history.