  We conduct a systematic search for periodic variables in the hot subdwarf
catalogue using data from the Zwicky Transient Facility. We present the
classification of 67 HW Vir binaries, 496 reflection effect, pulsation or
rotation sinusoids, 11 eclipsing signals, and 4 ellipsoidally modulated
binaries. Of these, 486 are new discoveries that have not been previously
published including a new mass-transferring hot subdwarf binary candidate.
These sources were determined by applying the Lomb-Scargle and Box Least
Squares periodograms along with manual inspection. We calculated variability
statistics on all periodic sources, and compared our results to traditional
methods of determining astrophysical variability. We find that $\approx60$\%
percent of variable targets, mostly sinusoidal variability, would have been
missed using a traditional $varindex$ cut. Most HW Virs, eclipsing systems and
all ellipsoidal variables were recovered with a $varindex\,>0.02$. We also find
a significant reddening effect, with some variable hot subdwarfs meshing with
the main sequence stripe in the Hertzprung-Russell Diagram. Examining the
positions of the variable stars in Galactic coordinates, we discover a higher
proportion of variable stars within $|b|<25^\circ$ of the Galactic Plane,
suggesting that the Galactic Plane may be fertile grounds for future
discoveries if photometric surveys can effectively process the clustered field.
