Guest Star Tommy Flannigan's facial scars are real, he receives them after being 'Chibbed' outside a Glasgow nightclub in his 20s, this is often referred to as a 'Glasgow Smiler' or just a 'Smiler' and is a common method of disfigurement used by the Peaky Blinders thanks to the razor blades concealed in the veins of their hats
Tommy Flanagan guest stars as Arthur Shelby Senior - the father of the Shelby boys. In reality, Flanagan is only 11 years older than Cillian Murphy (Tommy Shelby) and 13 years older than Paul Anderson (Arthur Shelby).