I liked the home video. It gave us a last, late insight into a slightly humorous and playful side to Logan that we hadn't seen, which was very poignant. It was painful to watch the three sibs watching it, too; it was clearly a side of Logan that he'd kept from them. Conor sitting quietly in the background made me well up; he alone saw that side of their dad, and he could have gloated about it then but he didn't. It was more like he was giving it to the others as a present.
The Barbados stuff I loved. It was like one of Shakespeare's enchanted islands or forests; the fact that the whole first 'act' between the siblings played out there made it so clear that things were going to go tits-up later. In this fantasy Arcadian world, they could float about in the water, they could wear casual/swimwear, they could get on, they could bond over Peter's special cheese 
and they could give Kendal the crown; but eventually they had to leave the enchanted world and put on their suits and sit in a boardroom. And that was when you remembered again that they are not 'serious people' and they cannot deal with the reality that Logan created and ruled over.
I loved Colin lurking in the background at the end; he knows exactly what Kendal did (not to mention how he tried to bully/threaten Colin out of talking to his therapist about it), and it feels like Kendal is doomed to cary him round for ever, like the Ancient Mariner and the albatross or like his own guilty conscience.
I always thought the dead waiter would come back in the end, but I'd imagined that it would get out into public, rather than that Kendal would basically lose the crown because of his own handling of it. Watching him telling the others he'd made up the story for sympathy was painful and shocking and actually embarrassing; the depths he'd sink to for power – not just allowing a cover-up but then compounding the lie about it.