Another theme could be the relationship between Dean and Castiel in this different time period. They might have to hide their true natures more, especially Castiel as an angel. Their bond could be explored in the context of the 50's secrecy and social norms. Maybe they have to pretend to be something they're not just to fit in while still trying to carry out their missions.
One common theme is the contrast between the 50's era and the supernatural world. The 50's had a certain aesthetic and set of values, and when combined with the Supernatural elements, it creates an interesting dynamic. For example, Dean's more modern - day sensibilities might clash with the more conservative 50's society while he's on a hunt with Castiel.
If you want the clearest chapter reference, go to Chapter 173. Early on, Jiang Li finally rose from her seat.; later, the chapter leans on Seeing her stand up, He Yun also stood up..
Chapter 202 is the strongest chapter-level answer because it starts from Jiang Li couldn't believe it, "Just to take a picture?" "Yes, just to take... and follows through on Give me the card." She stretched out her hand expressionlessly..
The best chapter pointer here is Chapter 207, "Keep these thirty points for yourself, I don't need them". It opens with After finishing, Sister-in-law Lan quickly took out the Good Evaluation... and closes on She had taken care of them for a longer time, she hadn't even had lunch,....
If you want the clearest chapter reference, go to Chapter 172. Early on, Not only Shu Yan, but the entire internet was shocked when they saw Su...; later, the chapter leans on Damn, what brand of make-up is Su Yinwan using?.
Chapter 182 is the strongest chapter-level answer because it starts from At this moment, Qi Tianyu, who had just arrived in the Capital, couldn't... and follows through on But Director," the assistant said, "are you really going to let them keep....
Look to Chapter 174 for the clearest answer. It begins with Does Young Master Jiang really care why I would come here?, keeps building through I'm here for the same reason you are." He had previously suspected the..., and lands on She knows the camera is on her, how can she still..." Jiang Li.
Chapter 220 is the strongest chapter-level answer because it starts from I know everyone has many questions, and I'm here to answer them one by... and follows through on However, Su Yinwan and Shang Shaojing weren't particularly attentive to....
If you want the clearest chapter reference, go to Chapter 204. Early on, Su Yinwan didn't move, but Director Qian turned around, ran to the...; later, the chapter leans on Seeing this, Su Yinwan clenched her fists in frustration..
Chapter 178 is the strongest chapter-level answer because it starts from Wen Jiaojiao is just too unreasonable, why does she have to single out... and follows through on Let's not even mention President Shang's own net worth, but talk about his....