Beginning at 44:30- Marcella's hair goes from wet to dry and back to wet.
When DI Rav Sangha arrives at Marcella's home to ask her about her old case, he mispronounces her first name "Marsella" instead of "Marchella" (the Italian pronunciation). But as Marcella's former partner, Laura Porter, is now Sangha's boss, Laura presumably would have spoken to him about Marcella and likely was the one who instructed him to ask her about the case in the first place, and thus he would have known how her name is pronounced.