Picard's Nexus fantasy should have involved him strapping a saddle on Beverly while Wesley hung from the top of the Christmas tree.
No wait, that was my fantasy.
I actually was okay with the Victorian Christmas. It sure beats a Space Christmas with a Space Tree and Space Gifts. Picard might not be "nostalgic" but he is a traditionalist. And yeah, Beverly should have been there. Then add a knowing glace from him to her at the end, resulting in Bev being cheerfully confused. Just a little hint that Picard realizes his feelings still exist and maybe he'll follow up.
Kirk's fantasy? Mostly I don't mind what we were given, but the horses were such blatant Shatner ass-kissing that it stuck out. Aside from Trek V (again, Shatner and his obsession), Kirk and horses didn't seem like a good fit. Or his uncle's barn in "Idaho." Now it's obvious "Idaho" was looped, but if they're gonna loop it, why not stick with "Iowa?"
Would it have been better as Edith instead of Antonia? Yes, but any familiar woman would have worked better. Carol Marcus would have worked because she was most recent and it would make sense that he blew a second chance because of a recall to duty. But I would have also been fine with "Ruth." I draw the line at Miramanee, though.