Ellis Rosen has a long post devoted to comics of his that have references that may be obscure.
Obscure references are the bread-and-butter of CIDU; I’m only going to put one here because the comics and the essay are Ellis’s work, not mine. It’s worth reading.
Comics I Don't Understand 
The original line from North by Northwest, the classic 1959 movie starring Cary Grant and directed by Alfred Hitchcock, is “That’s funny, that plane’s dustin’ crops where there ain’t no crops.”
I mostly had no trouble with Ellis Rosen’s references, but I’m mystified by Planned Service Changes.
The idea behind the reference in NxNW is that the plane is up to no good. It’s kind of funny to imagine being chased by a Zamboni.
Pretty good Cary Grant drawing, though I think the jaw needs to be a bit more chiseled.
I think Planned Service Changes is just a compendium of the confusing messages that can be posted concerning public transportation, sometimes accompanied by smiling riders but in this case by a drunk and a busker with a sax. With multiple signs being placed onto one, the messages are seemingly contradictory: “No Late Night Service”, “No Trains At This Station” and “5 trains replace the 2”.
I didn’t get “I have no mouth and I must sing”, myself, even though I frequently read science fiction.
But where ain’t there no ice in the Northwest Territories?
Another possibly obscure reference froj today:
https://featureassets.gocomics.com/assets/4a70c4e09021013eb772005056a9545d
zbicyclist – The Girl from Ipanema, a song that was frequently used as a basis for parody songs in the old Mad Magazine.
In Charades, I was given “Repent, Harlequin, said the Ticktock Man”, long before Harley Quinn & TikTok might gave given me handles. Time ran out, but they didn’t mention it, just let me flounder on.
Zbicyclist, I haven’t followed the link, but Harlan Ellison’s “I Have No Mouth and I Must Scream” comes immediately to my mind.
Relevant lyric from the Girl From Ipanema:
When she walks she’s like a samba that
Swings so cool and sways so gently
That when she passes
Each one she passes goes “ah!”
The magazine reader could be me. If I were to grab a current copy of People Magazine, it would definitely be Who The Hell Are All These People Magazine.
zbicyclist – The sax player may be related to the partial vertical sign starts out as “no A TR…” with “AIN” being hidden by the gentleman with the wrinkled tie. Maybe this means that the coal train is not affected by the service changes…
Jeez – talk about obscure references.
“Repent Harlequin, said the Ticktock Man” has a way of sticking in your mind that most short stories or even novels don’t. I remember it, despite not having read it in decades!