Factual error: When Leslie Ash is at the checkout she has to check a Cadbury's drinking chocolate tin but it is the wrong aged tin - a 1970's one not 1960's.
Continuity mistake: When Jimmy is riding along the cliff, the GS Scooter has a fly screen on the handle bars. When he rides back to take the long run up before jumping off the cliff, the fly screen disappears only to re-appear a couple of seconds later.
Factual error: The station scene shows a Class 50 Locomotive which did not work from Victoria. Looks more like Paddington Station. Victoria is the main station for the Brighton line.
Factual error: Many extras in the background of the fight scene are wearing late 70's clothes.
Factual error: In the scene where Jimmy and Steph are outside the cafe following the fight, the police arrive and they both run away. A modern pedestrian crossing button can be seen.
Revealing mistake: When Jimmy's mum draws back the curtains, a British Rail Class 43 (HST) goes past in the background, only in service since 1976. (00:43:51)
Continuity mistake: When Jimmy meets his old school pal Kevin Herriot at the public baths, Kevin's hair is quite short, but in the cafe after his bath his hair is long and bushy in a DA style.
Answer: Your description of "Mod" is too limited. It included a wider range of fashion styles beyond what you've described and included mini-skirts, geometric-patterned dresses, casual hip-hugger pants, leather coats and jackets, and so on. The same with hairstyles which varied from short, angular bobs, to beehives, and long tresses with feathered bangs. The "natural" look was also in style then, along with the more extreme make-up type. Steph certainly fit into the overall Mod style and culture.
raywest ★