Patlabor Does Not Have Naruto-Style Filler
Myth: the stand-alone police comedies are disposable non-canon episodes.
The television series is a chronological continuity of its own, and most of it is deliberately episodic. It has two obvious long-form Labor stories, the Phantom and Griffon arcs, surrounded by day-to-day SV2 cases and character episodes.
That makes 'filler' useful only as watch-guide shorthand. Episode 29 can stop the Griffon story so Division 2 can nearly collapse over a missing meal and still be completely true to what Patlabor is trying to watch.
How you can tell
If an episode teaches you how Division 2 works when nobody is saving Tokyo, it is doing character work even when the long plot does not move.
Why it matters
AnimeHistory marks many of these as GOOD FILLER rather than pretending the main story is the only real part of Patlabor.
Debut: Ep 003 - This Is SV2