The yellow backpack used for the $1M ransom is from The North Face
Rene Auberjonois (Freddie Fortune) previously appeared as a different character in season one's The Seance (1976).
Lory Walsh (Rita Morgan) previously appeared as a different character in season one's Lady Killer (1976).
The first time Kelly is talking to Rita's mother, under her blazer, she is wearing the same dark brown blouse with a white lace collar & cuffs she already wore the previous week, while shopping for Charlie's purple sweater, in The Prince and the Angel (1979).
Roz Kelly (Gert Thomas) appears as a different character - later in the same season - in Toni's Boys (1980).