Yay! I wanted U.N.I.T., I kept saying "Where's U.N.I.T.?" and then there was U.N.I.T.. Only in passing, but there they were. My continuity-obsessed heart was happy.
The Doctor took charge in a crisis! And he acted like the Doctor! He blithely took charge and people obeyed him! I love watching him do that--show up out of nowhere, start giving commands, and since they make sense, people do what he says.
Go Penelope Wilton! (She played Harriet Jones.)