As fans of Seinfeld well know, above Jerry's sink is a row of boxes of breakfast cereal. Above Kevin's sink is a row of glass containers containing natural grains.
The "Bizarro George"'s name is Gene, which Larry David's middle name, who (as it's been established) was the inspiration for the character George.
In "Normal" Jerry's apartment, he has a figure of Superman on a stand. Jerry explains the "Bizarro World" to Elaine by using Superman and Bizarro Superman (in the Legion of Doom). In "Bizarro" Jerry's (Kevin's) apartment, there is a figure of Bizarro Superman on a stand, at the exact opposite spot of Jerry's, like all of his other furniture.
When Elaine comes into Kevin's apartment, you can see the shadow of the boom mic sweep across the top of the door.
The photo of Gillian that George has had all sorts of things written about her on the back. When he hands the photo to Nikki, you can see the back of it is blank.
When George puts the hairdryer on the picture of his "dead wife", a flame is just about visible at the bottom of the screen when it's not meant to be
The boom mic falls into the frame when Elaine is on the street with the 6 men.
In the scene where Kramer comes home form work late Jerry has an ace bandage on from attempting to get a picture out of Man-Hands purse, yet in the next scene as they approach the bizaro threesome he has no bandage on.
The boom mic falls into the frame when Jerry walks into his living room to find Kramer cooking himself breakfast for his big day at his big job, where he "TCB" (Taking Care of Business).
The bag is thrown on the same chair that Kevin is helped into after Elaine pushes him down. The assumption is that the bag is moved to the floor so that Kevin can sit down.
When Elaine leaves Kevin's apartment, after pushing him on the floor, she picks her bag up from off of the floor but earlier in the scene when Elaine first entered Kevin's apartment she left her bag on the chair next to the table. We're never shown how her bag ended up on the floor.
(Jerry walks in and sees Kramer cooking breakfast.)
Kramer: Oh, good morning. This is breakfast… but I need to go, and I am going to work.
Jerry: How much time was I asleep?
George: Elaine! Can--can I come?
Elaine: I'm sorry....we already have a 'George.'
Gillian: I'm just gonna go wash my hands.
Jerry: Good idea. (under his breath) There's a beach towel on the rack.
Gillian: (smiles at him) Don't you just love lobster?
(Close-up of her Man hands tearing open a lobster.)
Elaine: These are good people, Jerry. They read!
Jerry: I read, I read!
Elaine: Books, Jerry.
Elaine: Would you prefer it if she had no hands at all.
Jerry: Would she have hooks.
Elaine: Do hooks make it more attractive, Jerry.
Jerry: Kinda cool looking.
Vargas: Hello Kevin…
Kevin: Hello… Vargas…
Jerry: She had man-hands.
Jerry: The hands of a man. It's like a creature out of Greek mythology. I mean, she was like part woman, part horrible beast.
Kramer: But I don't even really work here.
Boss: That's what makes this so difficult.
Kramer: You know what they say, you don't sell the steak, you sell the sizzle!
The Bizarro Superman statuette in Kevin's apartment was specially made for the episode. It is now owned by episode writer David Mandel and signed by the entire Seinfeld team.
This episode was nominated for the 1998 WGA Award (TV) for Episodic Comedy.
In this episode Elaine (the only woman in a group with three guys) finds another group of people who are eerily similar to her regular group, with a counterpart for each of the men. She hangs out with them instead of the regulars but the new group ditches her because she just doesn't fit in with them. This exact same plot occurs later this season on The Drew Carey Show in the episode "Drewstock".
Feldman (Bizarro Kramer) always knocks before entering Kevin's apartment, has great ideas, and always brings over food, while the actual Kramer barges in, has lousy ideas, and is always helping himself to Jerry's food.
Vargas is the Bizarro Newman. He works for Federal Express (instead of the USPS) and is friends with the Bizarro Jerry, Kevin.
In the Bizarro (Kevin's) apartment, in the spot where Jerrys bike would be hanging, Kevin has a uni-cycle there.
Jerry mentions that Man Hands had similar strength to George "The Animal" Steele, a popular pro wrestler in the 1980's, famed for his size, power and agression in the ring.
"My Baby Takes The Morning Train" was used in "The Butter Shave", not "The Voice". They both revolve around George's fake handicap at Play Now, so I guess it's easy to get them mixed up. I'm pretty sure it's also used in some other episode, I may be wrong.
In the scene where Elaine is talking to Kevin at Reggie's, she said something about the tuna tasting like a sponge. Could this be a reference to the episode "The Sponge", where George had to eat at Reggie's after being neglected by Jerry, Elaine and Susan?
Viewers Taylor Lasseigne and Michael Haemlin note in this episode that Kramer is seen working in this episode to the music of Sheena Easton's hit "My Baby Takes the Morning Train" was also used in "The Voice". Mike also notes that George uses "Vandelay" in this episode in his trick to show the picture of his deceased "fiance" to the beautiful receptionist.
Kevin's line "Me so happy, me want to cry" is an allusion to the actual Bizarro Superman, who in all presentations talks with an incomplete version of English.
George: Flame on!
As George and Jerry are talking about the Forbidden City, the conversation ends with George proclaiming, "Flame on!" This is the catchphrase of the Human Torch, a member of the Fantastic Four, who are Marvel Comics superheros.