Outside of the obvious, why wouldn't Belos possess Odalia instead of Raine if he's been rendered beyond desperate by his circumstances? Because he's still smart enough to know they're the better choice: Raine's Eda's ex so there's at least one person who'd hesitate to attack him, compared to everyone jumping to beat him if he took over Odalia. Furthermore, Raine's currently in a puppet state provided by the Collector, which is implied to be keeping them stable, while Odalia has no such protection to the Burnout should Belos take her over instead.
Why is Boscha desperate enough to get Amity back to her side to plead for it, when no prior episode showed her ever caring about it? Because she's literally the only person she has left: Cat and Amelia were turned into puppets and taken away, as have most of the adults, and while Skara's around, the two don't really interact in the whole episode. Given how she was arranged to be Amity's friend in the past, becoming friends again is her last chance to regain some of the normalcy and comfort she had before The Owl House-geddon.
It seems like nearly every adult in the Boiling Isles was already captured by the Collector by the time Luz and the others arrived while the only survivors (ones not explicitly spared by the Collector) are kids and teens. Given that nearly every adult had a coven sigil, they would have still been dazed and confused after the Collector began their assault even if they weren't present for the Day of Unity and not been able to run while the kids were already on edge from seeing their families suddenly fall ill and be prepared to run and hide.
The Collector immediately gets defensive when Lilith tries to save King and calls him her nephew, acting like she just said something mean to him. Which is not surprising since the Collector has for hundreds of years now seen how Belos treats his "nephews". It's not unlikely that the Collector thought Lilith and King's relationship is the same as Belos and Hunter's, and jumped to his new best friend's defense.
The ghosts don't move. At best, Caleb moves his head down and can close his eyes. But if the spirit that Luz saw at the beginning of the episode is any indication, ghosts and spirits should have more autonomy in their movement, independent of Belos' mind. But the ghosts only appear whenever Belos stops moving to catch his breath, meaning they are linked to Belos' declining sanity.
Caleb's hair has a ponytail. But according to the memories in Belos' mind, he had it cut when he reunited with Philip in the Boiling Isles (and subsequently got killed shortly afterwards). Since the ponytail is a symbolic representation of Caleb's old profession as a Witch Hunter (with the ponytail absence representing his willingness to change his perspective), it doesn't make sense for Caleb to have this hairstyle unless it's the version of the brother that Belos wants back.
Only Caleb and the Grimwalkers appear before Belos. Belos has killed countless witches and demons in addition to Caleb and the Grimwalkers, whether it be by tricking them to be a sacrifice, causing causalities from his False Flag Operations, using test subjects for the Draining Spell, and petrifying wild witches as an execution method. Yet, it's only Caleb and the Grimwalkers that appear to silently judge Belos. This wouldn't make sense unless it comes from Belos' subconscious because Caleb and the Grimwalkers are the only people that Belos would feel guilty about; in contrast, he kills witches and demons without missing a beat and sleeps well at night.
Caleb's expression is cold and full disgust, in contrast to the warm and always loving Caleb in Belos' memory portraits. While it may be possible that Caleb's spirit is disgusted with his brother's actions, it's still jarring to see a warm-hearted person be this cold and unforgiving to his little brother. But this Caleb is perfect as a manifestation of Belos' fears. An elder brother that looks at him like trash. An elder brother that is ready to punish his younger brother with a belt. This is how Belos envisions Caleb to be if he was alive, reflecting how his abusive and manipulative tactics on Hunter have actually made it more difficult for Belos to even know what true happiness and sadness are. And if that's not enough, Caleb's eyes lack light reflection, bearing more resemblance to Belos' icy cold eyes of present day, the same eyes that Hunter fears displeasing.
How did Belos know that King was connected to the Collector, or that he was plotting with Eda to take the Collector down? Because when Belos possessed Raine, he gained access to Raine's knowledge acquired over months of being conscious but trapped in puppet form. During that time, Eda still talked to Raine, likely venting to them about everything. By that same token, Belos is now well aware that King is a Titan.
It's implied by Belos Possessing a Dead Body of one of his grimwalkers that he's been extending his life by doing so for centuries. The fact that he looks different from how he did as Philip isn't from age, but because he's in the body of Caleb. His green scarring isn't an advancement of the injury Lilith inflicted, but his true form leaking through his meatsuit.
Given the Possession Burnout Hunter went through while Belos hijacked his body, what will happen to Raine? Will a palisman have to be sacrificed to save them?
Edric's injuries are Played for Laughs, but the story behind them is pure Nightmare Fuel. He fell down a well while running from the Collector's spies - a well with rocks at the bottom. Given that the apocalypse was happening, he was probably in that well a long time before he got found. And that's if he wasn't forced to climb out of it himself, all while severely injured.
The fact that he's still so badly injured, months after the Day of Unity, indicates either the Healing students are stretched so thin they can't spare much magic for him, or it's a goddamned miracle he survived. Possibly both.
Another possibility is that, like when Amity returned and he broke his cast to hug her, he just refuses to rest and recover, just further extending his recovery time. Could that have permanent consequences though?
