Goof When Dorothy told Stan "After three years, I didn't think you were coming back", that would mean that Kate (or Michael, who isn't seen, or mentioned, in this episode) would be at least 40. If you remember, Dorothy and Stan got married because Dorothy got pregnant at 17, and then were married for 38 years.
Kate looks nothing like a woman who is 40; she looks to be in her mid-twenties.
Continuity: While this episode centers around Dorothy and Stan's daughter, Kate, where is their son (and Kate's brother), Michael? Unless there was some strife in the family (which is NEVER mentioned), why wouldn't Michael come to Kate's wedding? There isn't even a mention of him at all.
Towards the end of the episode where Dorothy is confronting Stan, at time 22:50, you can see what seems to be camera equipment move into the shot towards the bottom left of the frame.
The scene where Dorothy squeezes Blanche's hand (as an aide to dealing with Stan) appears in the opening credits throughout season one.
The backdrop outside of Dorothy's window doesn't seem to match the establishing shot of the neighborhood at the beginning of each episode.
[Kate is hugging Sophia tightly]
Sophia: Relax... Relax... You're already in the will!
Sophia: Dorothy, anger is a lot like shredded wheat caught underneath your dentures. If you leave it there, you get a blister, and you've gotta eat Jell-O all week. If you get rid of it, the sore heals, and you feel better.
Dorothy: (pauses) Anger is like a piece of shredded wheat??
Sophia: Hey, if you want good lyrics, you listen to Neil Diamond. If you want good advice, you listen to your mother.
Sophia: It's time to throw rice at the kids.
Dorothy: I'm not in the mood, Ma.
Sophia: You're acting like a jerk.
Dorothy: Thanks, Ma, thanks. That really makes me feel better.
Sophia: Don't you talk back to your mother. Listen, Dorothy, you're my daughter and I love you dearly, but you're not the first woman to be dumped by her husband.
Blanche: And then one day, Stanley is gonna be out of your life completely.
Dorothy: Not completely. There will always be a little part of him that stays with me.
Rose: Of course, Dorothy. After 38 years. There are always bound to be some memories that stay with you.
Dorothy: I wasn't talking about memories. I was talking about this. (holding up Stan's toupee he left behind)
Dorothy: (after giving Stanley a long speech about him leaving her after 38 years of marriage) I finally get to have what you tried to cheat me out of. I finally get to say goodbye, Stanley.
Rose: (after realizing that Dorothy was going to cut the wedding cake) Oh, I thought you were going to stab Stan.
Dorothy: Don't be ridiculous! I mean, do you honestly believe that I would stab Stan at my own daughters wedding?
Rose: Oh, no. I guess not. (handing her the knife)
Dorothy: Well, of course not! I would wait until after the wedding. There are too many witnesses.
Dorothy: Have you ever met a man who knows how to push all your buttons?
Blanche: Just once. He was a cabana boy in Pensacola.
Stan: (showing pictures to Kate) That's me and Chrissy at a luau.
Dorothy: (pointing to the picture) Is she the one with the apple in her mouth?
Sophia: I never understood why people throw rice at weddings?
Dorothy: Because tomatoes leave stains.
Dorothy: (on the phone) Hello, Stan? Dorothy. Dorothy Zbornak. The one who gave you the best years of her thighs.
Rose: Kate dated Paul McCartney?
Dorothy: Yes, Rose. They wanted to get engaged but I insisted that she finish grade school.
Blanche: Dorothy, are you gonna be alright?
Rose: Of course she is. She's a trooper, aren't you Dorothy?
Dorothy: Not until I've tasted his BLOOD!!!
Dorothy: (As Rose comes into the living room) Oh, Rose. I'd like you to meet my ex-husband, Stan Zbornak.
Dorothy: And this is his hair.
Rose: It's a pleasure to meet you both.
Dorothy: You know, you're the greatest mother in the world.
Sophia: Tell me something I don't know.
The background shot behind the credits features Dorothy, Rose and Blanche looking on as Stan (off-screen) toasts Kate at her wedding.
This episode is also the first for Dorothy's daughter, Kate Zbornak, played by Lisa Jane Persky, in this episode.
This episode is the first for Herb Edelman, Stanley Zbornak, Dorothy's ex-husband.
(Talking about how Kate, Dorothy's daughter, may get lost on her way to the house)
Blanche: Dorothy, I gave Kate the directions over the phone.
Dorothy And who are you... Rand McNally?
Rand McNally is a publisher of maps (wall, street, and reference maps, including atlases).
Episode Title: Guess Who's Coming to the Wedding?
This is a reference to the 1967 movie "Guess Who's Coming to Dinner?" starring Katharine Hepburn and Sidney Poitier.