Are there examples of overtwisted manifolds with only a finite number of periodic Reeb orbits?
An example is given by the irrational ellipsoid in $(\mathbb{R}^4,\omega_\text{st})$, which is not overtwisted. The only other example that I know of are quotients of the last example on lens spaces. Actually, contact manifolds admitting only a finite number of periodic orbit are proven to "rarely exist" (https://arxiv.org/pdf/0809.5088.pdf).
(I am aware that under non-degeneracy condition on the contact form, the authors in https://arxiv.org/pdf/1701.02262.pdf prove that there are $2$ or $\infty$-many periodic Reeb orbits, but as far as I know nothing more is known if the contact structure is overtwisted).