Just finished watching this. I really enjoyed it, great writing and fantastic lead performance by Erin Doherty. The last couple of episodes were unbelievably tense.
I thought the two phone calls from Chloe were both missed calls, so there was no actual conversation, everything was just imagined scenarios while Becky was trying to figure out what had happened.
I agree some aspects required suspension of disbelief. I found Josh to be an unrealistic character - I would believe he admired her grift and was attracted to her in a "friends with benefits" way but in some of the scenes they were acting like boyfriend and girlfriend when he knew full well she was seeing Elliot. He just seemed to have unlimited patience. It would have been more plausible to write him as someone she had known and been friends with for a while, so he knew her true identity that way, rather than someone she'd just met.
Also it didn't make sense that the way the police didn't really seem to do a proper investigation into Chloe's death, given there was no evidence of any prior intention for Chloe to commit suicide, and the messages on her phone clearly established a pattern of controlling behaviour by her husband. But I can see this was necessary for the story.
It seemed like a major lapse in judgement for Becky to go to Elliot's house alone at the end to pick up her keys when she had just had it confirmed that he possibly killed his wife, and also he knew her true identity and was likely to become violent. I can't believe anyone would do this in real life.
Was also confused by what "big trouble" Elliot was in at the end. I get that it would be damaging for his reputation and political aspirations but was the implication that his role in Chloe's death was now being investigated properly? Surely the recording Becky posted on Chloe's social media account would be relatively easy to identify as dating to after Chloe's death. There would still be no evidence he pushed Chloe to her death unless her mother was prepared to testify that she had witnessed it, and it didn't seem like she was.