At 7 minutes in Frankie is trying to reach Caleb, her dad, on what is likely a HAM radio set. Jay says to Frankie "There's no point in leaving these messages". A HAM radio set is a 2-way radio. It's not capable of taking / storing messages. It's all live talk.
Towards the end of the episode there is zero knowledge of who reinstalled Maeve's Pearl processor. Last we saw of it Bernard placed it in the piano as he was updating the replacement Pearl.
37 min in. As hosts, Bernard and Stubbs would be able to break out of the restraints they are tied to the chairs with.
When Caleb falls into the floor vent to avoid incineration, there's a lot of dust particles on the ground. These could be human remains. However, considering how little remains cremation generates, this would mean that thousands have been incinerated.