Okey doke, here are some Cool Things I noticed in the final two episodes of the season:
I know I already posted about this, but one of the ideas Vox displays on his bulletin board in "Brighter" reads, "A Whole Week of Just Sharks", with the subtitle, "Did you know? Shark skin feels like sandpaper!" Vox canonically invented Shark Week.
One of the texts that Charlie sent Lucifer is a picture of a duck that says "I showed you my duck please respond".
When everyone is watching Angel on TV, Kiki and Fat Nuggets can be seen cuddling on the floor.
IMP headquarters can be seen in the background when Vox is unveiling his weapon! It is also seen throughout the party/battle scenes in the next episode. (Has it always been there? Am I only just now noticing this!?)
More "Yeah I Fucked Your Sister, So What?" discourse in the news tickers.
When Pentious tells Sera "it starts with sorry", he is posed the same way Charlie was posed when she first told him the same thing.
Vaggie's drawings foreshadow the circle that is formed in "Hear My Hope".
The file Baxter uploads is called "Charlie Presentation/Final2V7/ FinalFinalFinalForRealZ.Slideshow"
Charlie's presentation begins with a slide that reads "My Presentation Click to Add Subtitle"
Velvette traps Baxter with a text that reads "short stuff", and a text that reads "dumb fish nerd".
Considering 1) Nifty helped stop the weapon, and 2) the only characters with enough power to stop Vox's weapon were Emily, a head seraphim, Charlie, the princess of hell, and the overlords, we can infer that Nifty is an overlord!
Towards the end of "Hear My Hope", one of the sinners emerging from the rumble is the girl that signed with the Vees in "Hazbin Guarantee"
Charlie's powers manifest in the form of music notes, as we've seen before. Husk's appear to manifest in the form of playing cards, and Rosie's in the form of flowers.
Many familiar sinners can be scene in the hotel lobby in the final scene, including the apple tree sinner (who Nifty stabbed), and the horse sinner, who Emily saved.
The gift basket that Pentious sends Cherri includes cherry soda and "bombs popping candy". He also sends her a mug with their figures drawn on it, which is labelled "us fighting".
The hotel lobby, as well as Charlie's room, are filled with empty picture frames for future redeemed sinners!
As I've said before, I'm sure some of these have already been pointed out by others. And I'm positive that there are tons of other things that I haven't noticed yet. Season three is ages away, but we definitely have plenty to feast on until then!