One thing that the good morning / good evening videos have brought to light for me is the stark contrast of how differently Carrie and Oliver view their profession. When he talks about roles he'll say that it was an exciting project, or that it was challenging, he uses language that sort of makes you take seriously how dedicated he is to his craft. When Carrie talks about roles, it's quite childish and surface-level. In one of the videos they mention Anastasia and she says that she was obsessed with the film as a child right after talking about being interested in the main role, as if how much and for how long you've loved the source material justifies how much you deserve the role. She never really demonstrates a deep knowledge of theatre as an artform, it feels more like she's fulfilling girlish fantasies she had as a child.
She also comes off as being much, much older. I don't know if she was ever really around people her own age, but Oliver's stories about going to the pub, going on holiday, etc seem so normal and make her stories sound like they should come from someone about 15 years older than she is. His taste in clothing and general energy are just a lot more youthful too.