I almost never watch films twice but 'Aftersun' was a rare case where I absolutely had to. I don't think this film can be fully appreciated on first watch. I saw someone suggest that after you watch it your mind will go back to little moments and re-evaluate their significance, and it will. But watching it again with the full picture gives the entire movie a different perspective. The second watch is almost like watching a different film.
Kids in films, particularly in lead roles, can often be very annoying. That isn't an issue here. Frankie Corio gives one of the most likeable child performances I can ever remember seeing. Her chemistry with Paul Mescal was amazing. I read that she wasn't privy to Mescal's solo scene rehearsals, so that she wasn't fully aware of what his character was going through, much the same as her character Sophie wasn't. That's brilliant.
Something that was very apparent on second viewing was the significance of the music in the movie. The first time through I remember thinking, "there are a lot of good songs in this movie". On second viewing you realise that every song used is telling a story. It's telling you what is going on, but like most people in the real world, we just hear a banging song and nod our head to it. Then later on we reconsider its true meaning.
Finally, this film has one of the beast movie endings I can remember seeing. It's classy, heavy and thoughtful all at once. It's done in a beautiful and somewhat haunting way that will stick with me for a long time. 9.5/10.