CultBox have published their usual hints for Hide, which you can read below:
» A reference made in 'Army of Ghosts' is made here.
» It looks like the name of the show might change...
» A rather meta reference to '70s Doctor Who is made.
» There is a Scooby Doo moment.
» The Doctor comments on the heat of Clara's underwear.
» Something we see in 'The Five Doctors' is seen here.
» The Doctor's been rummaging through David Tennant's wardrobe.
» That's an interesting pronunciation of a Pertwee era planet.
» A noise not heard in some time is heard again.
» Clara and the TARDIS are not getting on.
Doctor Who: Hide airs on Saturday 20th April at 6.45pm on BBC One.