Isaac bumbling around in the astronaut outfit from 1.02 and Freddie's hilariously unsympathetic response.
Isaac: Um, Mr. Lyon? I can't breathe.
Freddie: Take it up with NASA.
Hector Madden: Fashion Police.
To Freddie from 1.03, when he's wearing his usual shabby-reporter chic to dinner at the Maddens' country house.
Hector: Freddie, you can't possibly wear that jacket! (double take) And those shoes!
To Freddie again, in 1.05. It's not just that Freddie's dressed as a woman, with a scarf knotted around his head, it's that Hector stops him from taking it off by saying "a lady never removes her hat in a gentleman's car".
Bel and Freddie's blase recounting in 2.02 of what they've been up to.
Freddie: Where have you been?
Bel: Buying pornography. You?
Freddie: Picking up fascists.
Virtually all of Lix's Deadpan Snarkery and patronizing of the younger journalists.
"Children, there will be tears."
"Remarkable, Mr. Wengrow, looks just like you or I."
The capper has to be her comment to Hector in 1.05:
Oh, beautiful tie, Hector! It goes SO nicely with your eyes. Weren't you wearing it yesterday?
Randall's deadpan response to Bel and Freddie pitching an interview with a fascist on the same day the BBC brass are going to be observing the show:
Randall: There might be better days to test-run this as an idea. Sundays are good.