These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Equally awesome is the rerecording used for the TV movies.
The CSI Effect: 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.
Ho Yay: *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.