A few little bits and bobs
The man perched in his car, I don't think he's rolling a cigarette, as he doesn't put anything to his mouth that I see. Even if he doesn't smoke it, he has to lick the paper! When I watched it I thought he was on a phone. It's the position men take when they're looking at a phone. It could be as others have suggested that he is just keeping his head down to not be seen. I'll look at it with that in mind and see if it fits for me.
I really thought that with the situation, the night ending not out of choice, that she might have killed some time flicking through tinder and met up with someone that way. That might sound like a shot out of the park, but it's what the young 'uns seem to do these days. Almost every week in work, when the 20 somethings are talking about their weekend, they've been linking up through tinder. Usually the other way round. "My mate/s wanted to go home early so I saw this bloke on tinder who was heading to the pub round the corner with his mates so I went and met up with them". This could be the reason they looked at one person so quickly. I had discounted that because I thought she didn't have a phone. Now I know she did. Just as she goes out of view in first section of CCTV she clearly throws her head back to flick her hair out and then puts a phone to her ear. After the stumble she also does that tell- tale hand on pocket to check my phone is still down low enough.
It appears she didn't go into her house when the taxi dropped her off, and her phone was found at her house. That doesn't mean to say she wasn't there any time in between (to have had her phone with her through the night out, and it be at home the next morning)
Please feel free to let me know if I've missed any facts