"When you're an orphanage boy with straight hair that nobody wants, then you might as well be dead, Rasmus thinks. But then he gets a brilliant idea. You can leave the orphanage and the strict headmistress Miss Hök. You can escape, go out into the world and find someone who wants one. If there aren't any girls with curly hair nearby to choose from, then they have to take one, Rasmus thinks.On the very first morning, Rasmus meets a tramp, Paradis-Oskar, who spent the night in the same barn as himself. Rasmus wonders if they can't keep up - and so begins their winding and exciting path together...Rasmus på luffen was a remake of The Tramp and Rasmus (1955). For the remake, Astrid Lindgren deleted some scenes from the old script and wrote some new scenes.During the filming, which took place in June-August 1981, director Olle Hellbom said:""We probably have a more psychological background to the events in this film. At one point it is very different and that is when Rasmus meets the tramp. In the old version, the hobo accepted Rasmus immediately - here the hobo is, and it's probably quite natural, very hesitant before he agrees to be Rasmus's father.”There were 700 young boys who wanted to play Rasmus. The choice fell on Erik Lindgren.The film was largely shot in Dagabygden in eastern Sörmland, in the areas around Ånhammar, Björndammen and several other locations. The city photos were taken in old Linköping. The railway inauguration was recorded at Dala-Järna station.Rasmus på luff was Olle Hellbom's last directorial work. He died on 5 June 1982 and was then in the middle of preparations for a film adaptation of Astrid Lindgren's "Ronja Rövardotter", which was instead directed by Tage Danielsson.