Rheya and Chandler both had an imaginary friend that their parents liked better than them.
A bus advertisement for Solaris is seen when Aaron returns to L.A.
Video case and poster are shown in a video store.
Lorelai suggests watching Solaris on TV and claims there must be a story in there somewhere.
A George Clooney look-alike mentions he doubled for Clooney in this film
The Virtual Reality planet Rhea references Kelvin's wife and the simulacrum Rheya (with spelling variation).
A still image from the movie is shown.
The movie poster is shown.
'George Clooney in 3 Minutes or Less' segment
Just like Solaris, Mabel's world is a place creating an illusion that a visitor's biggest dream comes true. Which makes the place a perfect trap.