At the very beginning, when the resistance fighters are brought into the mothership, Lt. James calls them lab animals and orders them to be taken to their quarters. It seems an unusual choice of words for people who are about to be fodder or test animals or even prisoners. They should have been sent to a holding cell instead.
When Diana is taking the prisoner down the hallway you can see the actual tape marking pink and orange on the floor where they will stop.
When Mike & Julie are posing as visitors aboard the mothership and Diana discovers them, she should have tried talking to them in her alien language.