As a movie, "Casablanca" exists in Toobworld and its many alternate dimensions. Too many TV characters have cited it in their own shows.
Here are just a few of so many examples......
First off, let's start off with five of the more famous quotes from the movie:
"Round Up The Usual Suspects"
'Mystery Science Theater 3000'
'The Fresh Prince Of Bel-Air'
"We'll Always Have Paris"
'The West Wing'
'American Horror Story'
"Play it again"
(Technically not in the movie; famously misquoted)
'The Cosby Show'
'Over The Top'
"Here's looking at you, Kid"
'A Different World'
'Home And Away'
'Married... With Children'
'As The World Turns'
Variations on "A beautiful friendship"
[start, beginning, etc.]
'Sanford And Son'
'B.J. And The Bear'
'The Incredible Hulk'
'Amazing Stories' - "Guilt Trip"
'Dempsey And Makepeace'
'Parker Lewis Can't Lose'
'Star Trek: Deep Space Nine'
And there were so many others I could have chosen from!
Some characters had the movie poster on their wall, as seen in:
'Our Old Friends'
'Deke Wilson's Mini-Mysteries'
'Curb Your Enthusiasm'
'Sabrina The Teenage Witch'
'In Plain Sight'
'Pretty Little Liars'
The movie is often mentioned by name, such as in:
'Poirot: Thirteen At Dinner'
(The Ustinov Poirot, from the Borderlands)
Some characters even imagine they are in the movie:
'That 70's Show'
'Two Guys, A Girl, And A Pizza Place'
|As seen in 'Fringe' ("The Abducted")|
And finally, the movie can be seen or heard playing (or the title seen on a marquee) during various scenes of:
'Homicide: Life On The Street'
'Terminator: The Sarah Connor Chronicles'
And that list never even took into account TV movies!
Here's lookin' at - well, you know the deal.......