In "That's My Boy??", Rob and Laura thought that they may have picked up the wrong child due to earlier mix-ups at the hospital. They finally contact Mr. and Mrs. Peters, and all suspicions disappear due to racial differences.
This exchange between Rob and Laura:
Rob: Did you know that one in every fifty million women has the wrong baby?
Laura: That's a cute trick; how does she manage it?
Rob: No, she doesn't have it while she's having it; after she has it, she has it!
In "The Curious Thing About Women," Rob finds that Laura has been reading his mail, so he writes a show about a woman reading her husband's mail. Laura sees the show and later repeats everything done by the woman on TV. The crowning moment of hilarity is when Rob walks in and finds the raft leaning against the wall with Laura hiding behind it, trying to contain her tears of shame. From the same episode, we have the reactions of Millie and Jerry, who come in to apologize for the ribbing they gave Laura, only to be reduced to helpless laughter at seeing her with the raft.
One episode features a man who claims to be Rob's old army buddy, but Rob does not recognize his face or his name. The man and his wife show up at the Petries' home and act in ways that make Rob and Laura suspect that he is a thief, prompting them to call the police. By the time the police get there, however, Rob has finally remembered who the man is and they've even bonded over their past experiences. Then the police officer arrives. At a loss for words, Rob has to improvise a quick, hilariously terrible reason for calling the officer over while still saving face with his army buddy.
Their snooping around to figure out the alleged army buddy's intentions is pretty hilarious too, like Rob trying to snoop using a glass of tomato juice and holding it the wrong way—and getting tomato juice in his ear when he holds it the right way.
In "It May Look Like a Walnut," Rob has a nightmare about a horror movie (starring Danny Thomas) in which aliens with eyes in the back of their heads invade and use walnuts to turn humans into aliens. The most memorable moment is Rob opening the closet door and hundreds of walnuts spilling out, with Laura sliding out soon afterwards.
In "Washington vs. the Bunny," Rob has a nightmare about his indecision over whether to go to Washington to do some talent scouting, as per his job, or stay at home and watch his son, Ritchie, perform in a school play as "the main bunny". The nightmare involves Laura dressed in a bunny costume and controlling Rob as a puppet and making him dance like one. At one point, there's this exchange:
Laura:(puppeting Rob) Bow for the people. (Rob does so) Now show how nicely you make a telephone call. Rob:(holding up a phone; nasally) Hello? I want to go to Washington! Laura: No! Now you say that the right way. Rob: Hello? I don't want to go to Washington! Laura: That's a good boy.
The episode "The Impractical Joker". Buddy humiliates Rob with the practical joke and the mild-mannered writer resorts to a Paranoia Gambit to get back at him. He continually tells Buddy that he's not going to do anything - to the point of calling him up in the middle of the night to do so - and comments once that when he one day plays a joke on him, it will be so "diabolically clever" that he'll never see it coming. Needless to say, this does nothing for Buddy's nervousness.
The Stinger at the end of "4 1/2" is particularly funny in and out of context. Dick Van Dyke addresses the audience:
Dick: Next week, by popular request, the whole cast is going to prison. Join us, won't you?
While in the living room, Rob and Buddy see the cabin's front door open on its own, it closes, the rocking chair briefly moves, and then the door opens and closes again.
Buddy: Go explain that. Rob: Well, it was probably just the wind, Buddy. The wind blew the door open and made the chair rock. That's all. Buddy: Yeah, well, what made the rocker stop rockin'? Rob: You know, I... the ghost got up and left. How do I know?
As a meta-example, Carl Reiner once related an experience from the days when he was actually trying to get the series picked up. Back when the original scripts were titled "Head of the Family" and Reiner had cast himself as the lead, he'd already tried to get the show picked up and failed. Discouraged, Reiner went on to other projects, but his agent kept trying because he refused to abandon a set of thirteen episodes already written. Eventually, the agent got a bite, and the following conversation ensued.
Carl Reiner: I don't want to fail with the same material twice.
Sheldon Leonard: It won't fail, because we'll get a better actor to play you.
The slow realization of Rob and Laura at the end of the episode "Gesundheit Darling" as they put together the fact that Rob is allergic to cat hair, Ritchie and his friend are taking care of a stray kitten, and Ritchie has just left carrying Rob's old electric razor.
In the episode Third One From the Left one of the chorus girls falls in love with Rob. His attempt to scare her off lead to her thinking they're engaged:
Rob: One thing's for sure, I am not going to marry her!