The UK release of The Quatermass Collection (TV) box set from the BBC includes an easter egg:
On disc 1, go to Special Features, highlight 'The Kneale Tapes', press LEFT then ENTER. This plays a short video clip of some Quatermass footage, overdubbed with comedy narration (1:48).
Source: I own a copy.
N.B. I don't know if the Australian release also includes this easter egg, as I don't own it.