The regular cast were very close: Spencer Banks and Cheryl Burfield are still friends (her husband was best man at his wedding), and godparents to each other's children.
"Look-in" magazine ran a comic-strip based on the show in 1971.
Tomkinson's Schooldays (1976), The Crossfire (1967), Telly Savalas Looks at Portsmouth (1981) and The Avenging Eagle (1978) all feature blasts of "Timeslip"'s theme-tune. This is because the piece is a stock track (and thus available to any production company) by Eduard Ben-Michael (as Edouard Michaël), the 'Earth' movement of 'Rite de la Terre' from 'Quatre Rituels Pour Orchestre', from the DeWolfe music library.
Peter Fairley, science correspondent for UK TV news company ITN, introduced the first two stories on-screen.
Episodes 21-24 (the majority of "The Day of the Clone"), plus one scene in episode 25, were made in black & white due to union action over a technicians' pay dispute at ITV (which effectively prevented any sales to US stations). However, although all of the episodes exist as monochrome 16mm film prints, only episode 12 (the sixth episode of "The Time of the Ice Box") is known to still survive as an original colour videotape copy.