Fez: What are you doing?
Jackie: I have to go to the bathroom.
Fez: Well, you should have thought of that before I locked you in your room.
Jackie says she can't stay locked up in her room because she needs to use the bathroom. But in the episode "2120 So. Michigan Ave." the room she's staying in was referred to as the one having its own bathroom. As Kelso said after checking this same room in the episode "2120 So. Michigan Ave.":
Kelso: Okay, Fez, this bedrooms clearly better 'cause it has its own bathroom, so... I'm gonna go ahead and be the bigger man and... give it to myself.
When Fez roller skates into Jackie's house of cards it is obvious that it is a prop card house as not all the cards fall apart, some remain taped/glued together.
(to Kitty, referring to stripping)
Sam: I can help you work on some moves.
Hyde: Oooh. No, I don't need to see that. That would be like watching my Mom strip. Which unfortunately I saw on 'take your son to work' day.
Leo (about Donna): Hey, it's the naked lady from the newspaper!
Fez: Ok, here's how you make fruit salad. First, let me squeeze those melons.
Jackie: Oh, aren't they nice and firm?
Fez: Yes.. Now grab my banana!
Jackie: Oh, it's huge!
The Landlord: (bursting through the door) All right you perverts, stop it right now... Another fruit salad? Why can't they ever be having sex?
Fez: Why don't you go to the kitchen and.. eh.. open us a bottle of wine?
Caroline: My doctor says I'm not supposed to drink when I take my meds. But what he doesn't know is I didn't take my meds!
Jackie: Fez! It's almost Wizard of Oz time and I did my hair like Dorothy. But there's no foreign character, so I made one up for you... The Butler.
Fez: Okay, racist Dorothy.....
In the Fez & Jackie Show sequence, a cursive "F" can be seen on Fez's shirt, and he and Jackie open two doors simultaneously that knock together, then they smile into the camera.
Both of these things are allusions to Laverene & Shirley, a mid-70s sitcom. The opening credits sequence for this show had the bumping doors, and Laverne always wore a sweater with a cursive "L" on it.
The end credits sequence, when the landlord, as played by Don Knotts, is listening at the door while Fez and Jackie are talking about fruit, is a direct homage to Three's Company and specifically to the character Ralph Furley, who was also played by Don Knotts. Mr. Furley was the landlord who was convinced he'd catch "the kids" doing things they should not be doing.