In the final scenes there are a number of references and (mis)quotes from Aliens.
The title for this episode was originally announced to be "Just us League of Heroes". The UK's CBBC channel premiered an episode called "The Unusual Suspects", on the 14th October 2015, as the thirteenth episode. It's unclear if either an episode was swapped in its place, or if this is a straight re-naming of the episode "Just us League of Heroes".