Continuity mistake: Many times during the episode, Det. Tubbs and the other characters mention that Tubbs killed Calderone. This is not accurate. In the episode "Caulderone's Return pt. 2," it is actually Crockett that kills Calderone and not Tubbs.
Revealing mistake: At the end when Tubbs shoots a man that is using his wife as a hostage, there is no muzzle or blast coming out of the gun.