[Doctor Who] going to watch "The Interstellar Song Contest", though I'm not familiar with what Eurovision is, and this is supposed to be a parody of/homage to that, so I feel like a lot of the references will be lost on me.

(SPOILERS)

Also, I've seen Russell T. Davies describe this episode as having "a flood" of spoilers, so I'm guessing this is a three part finale rather than a two part one (with this episode tying in with the final two), and it will reveal the identity of Mrs. Flood. (that wording isn't exactly subtle)

Kind of horrifying that the host is cryogenically frozen for at least an entire year, only able to spend a few hours hosting a show before being send back to being frozen. (he doesn't seem to mind it, though)

Not sure who Rylan is, but he's someone who seems to be known in 2025. (not sure if he's the actual host of Eurovision or not)

I felt the need to pause and read the planets on display. I see Alpha Centauri, Zygon New Colony, Lizoko, Neptunia (?), and a few others that are kind of blurry.

I like how the Doctor seems concerned that they're taking someone else's seats.

The Doctor is going to accidentally cause a break-up of that couple. (which reminds me of a story that I read online about how someone's parents divorced due to the show Angela Anaconda)

JESUS

I saw this in the preview, but I thought it would happen at the end of the episode and the Doctor would foil it.

"People called me a monster my whole life because I have horns, so I'm going to slaughter thousands/millions" isn't a very good justification.

Okay, so they aren't all dead yet.

Not sure if Susan is actually in the TARDIS or it's just for the sake of the visual.

I'm guessing Cora is either a Hellion or was on their planet when it was attacked/devastated.

I just noticed that characters in the distant future know what Earth is now, while they didn't know that in "The Well"

Cora's friend/producer is surprisingly space-racist. (spacist?)

I feel like they're forgetting about the TARDIS. (though I suppose the TARDIS will work her way back to wherever the Doctor is eventually)

Watching Cora's final song reminds me of how beautiful music can be even if you don't understand what's being said.

"They all died in a single second. Every last Time Lord."

A. the Master was very efficient
B. the Master, Omega (I assume - I think he's still in the anti-matter universe), Susan, etc.: "what am I, chopped liver?"

I feel like Mrs. Flood is going to use the Vindicators to somehow cause the destruction of Earth that the Doctor and Belinda are trying to find out about.

They brought back Carol Ann Ford as Susan (if she does appear in the finale, I'm not sure if they'd have her regenerate), and it looks like there's a mid-credits scene.

Bold move to make the mysterious behind-the-scenes villain who's been lurking around for two seasons turn out to be a character who (to my limited knowledge) has only appeared twice in the show, with both of those times being in what is (as far as I know) the show's most unpopular era.

(though there are large gaps in my classic Who knowledge, and from what I've read, people have been speculating that this character would return since Missy at the very least)

The new actress seems to fit the role from the one serial that I've seen the character from, and Mrs. Flood continues to (sort of, in this case) break the fourth wall.