At the end of the episode when Sheldon shoots Leonard with the paint-ball gun we can distinctively see that Sheldon shoots five shots, but when the camera cuts to Leonard he has seven green colored spots on his suit.
Leonard says that the Szechuan Palace closed two years ago, nevertheless he also tells Penny that she had the chance of being in a relationship with him for a year and a half. The first time Penny and Leonard dated was also at the time when Sheldon was confronting that restaurant for passing Orange chicken as Tangerine chicken.
(Penny is sitting on the couch, in Sheldon's spot)
Sheldon: You're in my spot.
Penny: Are you planning on sitting here?
Sheldon: No, I'm going to the comic book store.
Penny: Then what difference does it make?
Sheldon: (incredulous) "What difference does it make?"
Leonard: Here we go.
Sheldon: That is my spot. In an ever-changing world, it is a single point of consistency. If my life were expressed as a function on a four-dimensional Cartesian coordinate system, that spot, at the moment I first sat on it, would be (0,0,0,0).
Leonard: Don't sit in his spot.
(Leonard unsuccessfully tries to clean the paintball stain Penny made in Sheldon's spot)
Penny: Do you think he'll notice?
Leonard: There's a chance.
Penny: What are we going to do?
Leonard: We? No, no, no. You had your chance to be "we" for, like, a year and a half now.
(Wolowitz checks his caller ID)
Wolowitz: Ooh, looks like I'm gonna have sex tonight. (answers) Hey, baby...
Penny: His right hand is calling him?
Penny: Okay, fine, what if we just flip it over? (flips over the couch cushion) There! Looks fine, right?
Leonard: Mmm... butt print. There's no discernible butt print.
Penny: Oh, come on. (sits on the cushion and wiggles around) There, butt print.
Leonard: It's too small and too… perfect.
Penny: (flattered) Oh, thank you!
(while playing paintball, they found themselves surrounded)
Raj: We need a plan. How about Operation Hammer of the Gods?
Leonard: I forget, which one is Hammer of the Gods?
Raj: We hide behind the Dumpsters in the parking lot and ambush people when they come to pee.
(Wolowitz and Leslie are in bed after sleeping together)
Leslie: Boy, your heart's racing. I must've really gotten you going.
Wolowitz: Well, it's partly you, partly my transient idiopathic arrhythmia.
This episode's end titles has Chuck Lorre's Vanity Card #242.
The German episode title is "Die Kissen-Katastrophe", meaning "The Cushion Catastrophe". The French title is "Le Coussin irremplaçable", meaning "The Irreplaceable Cushion". The Italian title is "La saturazione del cuscino", and the Spanish title is "La saturación del cojín", both exact translations. The Mexican title is "La mancha del cojín", meaning "The Stain on the Cushion".
This episode marks the final appearance by Sara Gilbert as a main star. Signed to a contract as a series regular at season's start, writers were unable to find storylines to place Leslie Winkle and subsequently dropped Sara from contract.
International Airdates: Latin America: March 31, 2009 on Warner Channel; Australia: August 31, 2009 on Channel 9; Turkey: December 21, 2009 on CNBC-e; Finland: January 25, 2010 on Sub; Czech Republic: November 17, 2010 on Prima COOL; Slovakia: October 5, 2011 on Markiza
Raj says, "God, I love the smell of paintballs in the morning," playing on a line by Kilgore in the 1979 film, Apocalypse Now, where he says, "I love the smell of napalm in the morning."