It is revealed that Barb's last name is Baran.
It is revealed that Old Christine pays $30,000 a year to send Ritchie to Westbridge.
It would have been physically impossible for Christine to be laying face-down on the floor while having her foot caught on the toilet (unless she'd horribly broken her leg or dislocated her knee in the process).
We learn Ritchie's middle name is Mortimer.
When Lucy makes reference to a Cloak of Invisibility being from Dungeons & Dragons, Matthew corrects her, saying that's from the Harry Potter universe. Actually, a Cloak of Invisibility is a standard magic item from the D&D world as well.
Though Ritchie is playing a modern Nintendo Wii gaming system, the sound effects heard are those from the Atari 2600 version of Pac-Man.
When Neil appears by Christine's sofa to wrangle the snake, she and Richard change positions between shots.
When Barb tells Christine about her article, she says it's in Black Women's Business Weekly. When Ali asks about the publication seconds later, Barb calls it a monthly.
Richard said that Ritchie can't go camping. However, in "Friends", he went on a camping trip.
Barb is two years younger than Christine.
In the opening scene, the tissue box between Christine and Barb moves positions several times for no apparent reason.
At one point, a montage is shown with clips from previous episodes, showing the closeness between Christine and Matthew. Those episodes were: "Come To Papa Jeff", "Supertramp", "The Answer Is Maybe", "Mission: Impossible"
We learn that Christine's maiden name is Kimble.
During the scene when Richard complains about Old Christine getting him fired, you can see someone lingering through the front door.
An episode of The Golden Girls bares a slight resemblence to this episode, and is also titled the same.
Barb tells Christine that she called her "Cricket" in her sleep-medicated phone calls. Wanda Sykes played a character named Cricket on Will & Grace.
When Christine approaches a bunch of Germans at the party, one of them says to the others with a Bavarian accent: "Und seit der Wiedervereinigung ist die Lebensqualität im Osten ja nur schlechter geworden." Which translates: "And ever since the reunification the quality of life in the East only worsened."
A running gag in this episode is about Christine telling stories about having sex on prom night with some guy named Allan Rice, the name of one of the show's writers.
In the scene in the classroom, Mr. Harris leaves the eraser stuck to the board. After some camera changes the eraser is gone. Later it is back again.
Caught praying, Richie pretends to have been playing his GameBoy Advance, and tells Christine he was playing Battlefront II. This would prove difficult, as that game has never been released for that system.