The scene where part of a lit match breaks off and hits Lowry (Timothy Spall) on the cheek was an unscripted accident but kept in because of the realism it brought and that it reflected the despondency the character was feeling at that time.
Timothy Spall had previously spent two years studying and learning to paint, in preparation for his role as J.M.W. Turner in Mike Leigh's 2014 biopic, Mr Turner.
LS Lowry would have been, 47 years old in 1934 when this film was set. Timothy Spall, who plays the role was 61 at the time of filming.
The house shown in the film is not the Lowry house. He lived at 117 Station Rd, Pendlebury - check Streetview. The exteriors were filmed on location in Manchester, Lancashire. The only studio shots were the scenes set inside the house.
At the end of the film the further fate of Mrs Lowry and her son, L.S. Lowry, are outlined in text on screen: "Elizabeth Lowry died in 1939. Later that year L.S. Lowry received his first major exhibition in London. L.S. Lowry became one of the most famous and beloved British artists. Today his paintings sell for millions of pounds. He was offered an OBE and a Knighthood in 1968. He turned both honours down, 'There seemed little point... once mother was dead.' In October 2000 The Lowry arts centre was opened in Salford Quays in honour of LS Lowry and his work."