Lt. Uhura appears in overhead shots of the bridge, even though Lt. M'Ress mans the communications station in previous shots.
At 9:42 when Anne Nored addresses Dr. McCoy in sickbay, she sometimes wears her comm badge and sometimes does not.
During the battle scene between the Romulan ships and the Enterprise, Anne Nored abruptly appears on the Enterprise's bridge.
Communications Officer M'Ress wears the red tunic of Ship's Services, but her chest insignia is the oval-within-a-circle of Sciences, not the spiral of Ship's Services.
During the battle scenes with the Romulans, the Romulan ships are Klingon D7 class birds of prey not Romulan warbirds.
At 17:36, during the conversation between Lt. Nored and Carter, her chest insignia alternates from left to right.
Spock says Vendorians can rearrange their molecular structure into anything with the same general size and mass, yet it imitates humanoids and a medical table, which all display significant more mass that the Vendorian does.