** The show's InstrumentalThemeTune, "Park Avenue Beat", by Fred Steiner. [[http://www.youtube.com/watch?v=paAIbMKb7eY Seriously, just listen.]]
** Equally awesome is the [[http://www.youtube.com/watch?v=aJqbBwLdfEE rerecording]] used for the TV movies.
* TheCSIEffect: Real-life defense attorneys started to notice a "Perry Mason Syndrome" with juries becoming hesitant to acquit a defendant without a confession from someone else on the stand (the standard is, of course, reasonable doubt). Some prosecutors similarly noticed a hesitance to ''convict'' without a confession on the stand.
** Viewers may not catch on for some time that most of Perry's "trials" are actually pre-trial hearings. They're held to determine whether or not there should even be a trial. Part of the reason it was done this way was to avoid having to cast twelve more people to play a jury.
** In one episode, Mason defends a man played by Robert Stack. Decades later, Raymond Burr hosted the first ''Series/UnsolvedMysteries'' special before Robert Stack took over the job.
** Some of Raymond Burr's previous roles as TheHeavy (or, in the case of ''Film/RearWindow'', the [[spoiler:murderer]]) could count as this thanks to Perry Mason eventually becoming Burr's best-known role. In fact, Burr had played the ''District'' Attorney in one film.
* HoYay: "The Case of the Jaded Joker": Comedian Danny Ross lives in a house with a man named Freddie Green, and they seem to spend a lot of time together. Danny is also adamant that Perry represent Freddie.
-->'''Paul Drake:''' One day, [Freddie]'s picking up pennies, doing two-bit errands for any guy that's got two bits in his pocket. The next day, he's living in luxury at Ross's expense.
** Female example: In "The Case of the Gilded Lily", Mrs. Brent and the secretary, Enid Griffin seem to take more of a liking to one another than one would expect for mere acquaintances.
*** In "The Case of the Foot-Loose Doll", [[spoiler:the false]] Fern Driscoll seems to have a kind of thing for the just-dumped fiancée, Mildred.
* OnlyTheCreatorDoesItRight: Some fans apply this to any revival done after Erle Stanley Gardner died in 1970.
* TheScrappy: David Gideon, an eager young law student brought in to assist Perry. He doesn't last.