Analogy Backfire: When Andy dates a girl Jim dislikes, he compares this with him and Osama bin Laden being together to Cheryl and Andy (on separate occasions) in order to make his point, only for this trope to take place (Andy contemplates turning bin Laden in for reward, whereas Cheryl wonders whether the relationship is serious), much to Jim's frustration.
Bucket Booby-Trap: Double subverted. The kids tricked Andy into thinking they were going to do it, then when he refuses to fall for it and puts on his slippers, he gets pudding all over his feet. Then he chases the kids into the kitchen to get pudding dropped on his head.
Crazy-Prepared: Cheryl kept a binder listing all the times she was right about something and Jim was wrong from the day they started dating in the off-chance Jim suggested that he was right about things more than she was.
Disappeared Dad: Jim's dad left him when he was a kid, reuniting with him after 35 years.
Drink Order: How Jim judges women's personalities. White wine=classy yet unpretentious, lemon drop=high maintenance, and cosmos=Ax-Crazy.
Double Standard: In several episodes Cheryl will get mad at Jim for saying something stupid, usually sexist. Only to later find herself in a situation in which proves Jim was right, and goes to great lengths to prevent him from finding out.
For example in one episode Jim explains that men and women's brains are wired so they won't remember certain things, Cheryl gets mad at him, only to later find herself trapped in the garage because none of the girls can remember the key code for the door, which her toddler son punches in effortlessly. She makes one last ditch effort to prove him wrong but can't even remember the code when hes just explained it to her.
Eating Contest: Jim and Andy participate in one that involves hot dogs, whose winner would get to be in a local commercial for said hot dog. Too bad for them a woman ends up the winner. Jim's so disgruntled that he challenges her to another one.
Escalating War: Between Jim and Andy, in two separate episodes, all for a grill.
Ironic Echo Cut: Jim competes in an Eating Contest during a family picnic. Cheryl urges him to stop, but Jim replies: "They'd have to pump my stomach before I quit!" Cut to the next scene where paramedics carry Jim off to hospital, saying: "He'll be fine after we pump his stomach."
Jerkass: Everybody has their moment of this from time to time. The most prominent examples being Jim, Dana, and Andy.
No Name Given: Jim, Cheryl, Andy, and the kids are only referred to by their first names. Dana originally had no last name as well, but this changed after she married Dr. Ryan Gibson and adopted his surname.
Jim's also got a very healthy and friendly relationship with his mother in-law, to the point that Andy often got jealous about Jim being her favourite "son". When Dana married Ryan, Jim actually became jealous of losing his spot.
Reading the Stage Directions Out Loud: When Jim uses an earpiece and hidden microphone to communicate to Andy, he tells him to tell the girl he's picking up to "Stay beautiful," and walk away. Andy tells her "Stay beautiful and walk away." Twice.
Real Life Writes the Plot: Courtney Thorne-Smith's pregnancy was written in, and so were both of Kimberly Williams-Paisley's pregnancies.
Sibling Rivalry: Between Andy and Dana, and sometimes between the both of them and Cheryl.
Sorry, I'm Gay: When Andy tries to flirt with Dana's boss, she says she is gay. After he says he had no idea, she says it just happened.
Sure, Let's Go with That: what with this show heavily relying on wacky antics, this is pretty much a given. Case in point - the episode with Andy buying... er, "second-hand" jewels for his fiancée, and hen sharing the same plan with Jim. When Cheryl asks Jim if that was in order to make it the "best birthday ever", he pretty much goes with that hypothesis.
You Look Familiar: The same guest actor to play Jim's son in Imagine Spots of the future—and for various other random roles throughout the series, including a waiter and a lonely guy at the bar—was Jim Belushi's real son.