This film was to star Rajesh Khanna and Saira Banu in the lead but Khanna had date issues so asked director to take some one else.Then director replaced Khanna with Dharmendra.
Resham ki dori performed well at the box office. Dharam-Saira went onto act in 5 more movies in the mid-70's. The long delayed International Crook, Saazish, Jwar Bhata, Hrishikesh Mukherjee's Chaitali and Pocket Maar.
Dharmendra and Saira also in Aai Milan ki Bela, Aadmi aur Insan