Continuity
The tuxedo the Doctor wears has made two previous appearances, first in "The Age of Steel"/"Rise of the Cybermen" and then again in "The Lazarus Experiment". The Doctor tells Martha Jones that bad things always seem to happen when he wears it.
Bannakaffalatta's species is not specifically named until The End of Time.
When the Doctor meets Midshipman Frame he is excited to learn his first name is Alonso. In "Army of Ghosts", the Doctor mentions that he always wanted to meet someone named Alonso so that he could exclaim "Allons-y Alonso!". He gets his wish at the end of this episode, yelling it before saving the ship. Midshipman Frame would also appear in The End of Time in the bar scene when the Doctor hooks him up with Jack Harkness.
In an alternate universe in the episode "Turn Left" the Titanic does crash into London, completely wiping it off the map.
Read more about this topic: Voyage Of The Damned (Doctor Who)
Famous quotes containing the word continuity:
“Continuous eloquence wearies.... Grandeur must be abandoned to be appreciated. Continuity in everything is unpleasant. Cold is agreeable, that we may get warm.”
—Blaise Pascal (1623–1662)
“Only the family, society’s smallest unit, can change and yet maintain enough continuity to rear children who will not be “strangers in a strange land,” who will be rooted firmly enough to grow and adapt.”
—Salvador Minuchin (20th century)
“Every society consists of men in the process of developing from children into parents. To assure continuity of tradition, society must early prepare for parenthood in its children; and it must take care of the unavoidable remnants of infantility in its adults. This is a large order, especially since a society needs many beings who can follow, a few who can lead, and some who can do both, alternately or in different areas of life.”
—Erik H. Erikson (1904–1994)