Laura June Hudson plays the ill-fated Elderly Woman. She had been a BBC Costume Designer on the original show, working on eight stories between 1978-81. Tom Baker declared her his favourite, loving her operatic style.
Playing Timothy Drake, discoverer of The Devil's Chord, is Jeremy Limb. He's the son of 1980's Doctor Who (1963) composer and BBC Radiophonic Workshopper Roger Limb.
In the manner of earlier Doctor's shouts of "Allons-y!" or "Geronimo!", the Fifteenth cries "Hadi ama!" - Turkish for "come on!"
The TARDIS elects to materialise in a spot recreating the cover of The Beatles' 1969 album "Abbey Road"; even the white VW Beetle on the left (reg. LMW 281F) is present. This is all clever camerawork: the scene wasn't shot at Abbey Road at all but a street in central Cardiff.
In reality, Monday 11th February 1963 did see The Beatles record ten songs, over three sessions, for their debut album "Please Please Me", at EMI's Studio 2 on Abbey Road.