Harry Morgan, the actor cast to play Officer Gannon, stood only 5'6", and would have failed the height requirement for LAPD officers at that time.
In this show and Adam-12, whenever they show a ransacked house, the paintings are always nicely hung at a perfectly aligned diagonal angle, even when they're up high, with undisturbed, heavy and tall furniture in front of them, making it impossible to reach said paintings. To indicate disarray, a painting would be askew or coming half off the wall and would wobble or swing, but this production simply carefully hung the paintings on the bias, and flat against the wall so that the picture is seen and they don't move, revealing that they were hung that way to being with, rather than disrupted by a rowdy party or burglary.
On occasion, both Friday or Gannon will answer a telephone, spend a few seconds listening, and then relate the contents of the conversation to the other, usually taking far longer than they were on the phone.
Recurring: when Gannon and Friday are listening to someone, they often both nod repeatedly, they even will look at each other and shake their heads no in unison. It looks odd---a bit reminiscent of the Muppets, when those close their mouths as they are agreeing to something. Meaning, there is no character life---no thinking process behind their action---to back up their constant nodding; they simply nod or shake their heads no because the script calls for it and it looks contrived, and the actors stiff and unnatural.