Yeah, the common ones are lam-alif showing لا , and alif-lam-lam-heh showing الله .

But for example خ/ح/چ at the end of a word often form cool ligatures, and the dots on ب/پ/ت often go to interesting places, and سے forms a cool ligature where it uses the other form of the bari yeh and the س forms little teeth marks up top. (Some of these are Urdu-specific; I can read regular Arabic but I have more experience trying to read Urdu calligraphy)

Arabic calligraphy can be pretty involved.