-Nyssa suddenly is back on Earth and living in Australia, and is in a relationship with Tegan
-Captain Jack turns up at Sarah's funeral (maybe he should have warned someone there about the Lone Cyberman?)
-Surprisingly, the Trickster shows up (given Gareth Roberts being cancelled, I didn't think that'd have been possible or appropriate, not unless he was co-created by Davies) but is dispatched pretty quickly, and without elaboration
-Katy Manning and Sophie Aldred are in it as Jo and Ace. Sophie never appeared in SJA but was scheduled to before Sladen passed, and she makes reference to the unseen adventure. RTD shoe-horns in the Seventh Doctor pining for Sarah (maybe this is why he visits her in the comic strip story "Train Flight?")
-Luke confirms he's been married for five years to the boy he talked about in SJA (blimey, he married a bit young)
-Clyde talks about having a fondness for Sarah, but not much else.
-Rani theorizes that Sarah was rescued last minute by The Doctor and they're out in the universe exploring together 'forever'...effectively making Sarah the endgame companion.