Chapter 9: The Marshal - S2-E1
Revealing mistake: The Marshall and Mando have a casual conversation between speeder bikes, even when the sound the engines make at that speed is deafening (there's a sample of it during the establishing shots!) and the sound of their words wouldn't propagate properly. He also must be wearing an invisible Mandalorian helmet or use beskar-based gel, because his hair barely moves. (00:20:25)
Chosen answer: They could be just like wrinkles from age, like the elderly Togruta in the Zygerrian slaver arc in The Clone Wars series, as Ahsoka is considerably older than her animated appearances. I think there is probably a character design/stylisation aspect to it as well - the other Togruta we've seen in live action, Shaak Ti, has four segments or folds in her lekku that were not visible in her Clone Wars appearances, so it would seem the character design in Clone Wars and Rebels reduces such features.
Sierra1 ★