Prithviraj Kapoor practically dubbed for the film from his death bed.
Kal Aaj Aur Kal was the first film of Randhir Kapoor as actor and director and this film was the last film of Shanker-Jaikishan for R.K.Films.
VENUS - Shocking Blue - 1969 was used in the film.
Film featured actor Randhir Kapoor's wife, father and grandfather
Kal Aaj Aur Kal was the last R.K.Films Shanker-Jaikishan composed music, they worked together with R.K.Films from year 1949 to 1971, about 22 years.