The ending of "The Night the Roof Fell In" when Rob and Laura make up.
The ending of "Who Owes Who What" is equal parts heartwarming and funny: Laura tells Rob that she'll "owe him" the kiss he wants. He ends up chasing her around the room while she stays just out of reach.
Rob's surprise birthday party.
The Reveal of "Bank Book 6565696". After Rob has been increasingly harassing Laura over having a separate bank account, she tearfully spills the secret — she was stashing extra money away so that, some years later, she could get Rob "a big important present"note a sports car he's been "drooling over", like her mother got her father on one of their later anniversaries. Rob, utterly ashamed of having been so hard on her, starts cracking jokes. Laura initially assumes he's making fun of her:
Earlier in the same episode, Sally lists Rob and Buddy as the two men she considers least likely to ever cheat on their wives.
"The Man from Emperor": Rob's old colleague Drew Patton, a Hugh Hefner-like magazine star, calls him to ask him to repeat an analogy he made earlier. With Laura (who had become increasingly worried about Rob "crumbling" under the pressure of being around beautiful women all day) standing by, Rob repeats the statement: that to some men, the constraints of marriage make it a prison, but to others, it's more like an amusement park that contains "everything fun in life." The producer then asks to speak to Laura.
Drew Patton: You know how I said that Rob was either scared or lying or deadnote the only kind of men who wouldn't admit to getting "vicarious kicks" out of his lifestyle?
Drew Patton: Well, old Rob is none of those things.
Laura: Oh? What is he?
Drew Patton: He's sick! [hangs up]
Laura: Did you hear that? He thinks that you're sick! Isn't that wonderful?
The early episode "Jealousy" has Laura worrying about the fact that Rob keeps having to stay late to rehearse with the show's beautiful guest star. She's all-but convinced that Rob is having an affair, to the point that she actually sneaks over to watch one of the rehearsals...and finds that not only is the actress a perfectly nice, professional lady, but that Rob has been spending their rehearsals telling her all about his family in glowing terms.
One episode shows a flashback to when Laura came into the office to announce that she was pregnant. At first the only person she meets is Sally (the others are in a meeting). After a little banter, Sally figures out why she's there and immediately calls Rob in. Laura asks how she knew:
Sally: "Your smile. It's obvious you're smiling for two now."
Rob spends most of "The Meershatz Pipe" feeling under appreciated and unwanted, a feeling that grows worse when he gets sick and the show seems to go on fine without him. Then, at the end of the show (which Rob takes as proof of his irrelevance) Alan calls him on the air to tell him that they all need him to get better and come back to work soon because they can't stand writing another show without him. It's especially heartwarming since Alan very rarely expresses any appreciation for the writers.
The ending of "The Foul Weather Girl". A young, talented, and beautiful girl that Rob knew in high school has come to New York to try and break into show business, and basically shanghais Rob into helping her. Laura goes crazy with jealousy as he sacrifices several nights for this girl, afraid that when she makes it big she'll be "grateful" to Rob (and all that implies). In the end, when the woman gets a spot on the Alan Brady show, she ends up thanking Mel for helping her (because he's the one with the power), essentially ignoring Rob's contribution to her success entirely. Watching this on television, Laura immediately flies into an angry rant on Rob's behalf, even threatening to call the producers of the show. Rob just calmly and happily hugs her.