Canada, Eh?: In "The Trainer," the other characters find out he was born in Canada and react accordingly. This is an Actor Allusion. (In one outtake, Dave Foley really does tack an accidental "eh" onto the end of a line.)
The Cassandra: Dave is a terrific news director. He's tough, has foresight, good instincts and a lot of common sense, and is a BS detector. Despite this, nobody at the office ever believes his warnings and his authority is roundly dismissed, as much of the staff see him as just a killjoy.
Character Development: While the other characters were pretty much Flanderized in typical sitcom style, Dave had more of an arc: first he was alarmed by the craziness of his coworkers, then he got used to them and learned to manage them, and in the final season he simply got sick of it all until he didn't want to make the move to New Hampshire in the series finale.
Closet Geek: Stargate Defender. Also, when Matthew buys him a sword, he waits until he's alone in the office and then pretends to be Obi-Wan Kenobi.
Kawaisa: Dave is an in-universe example of cuteness, much to his frustration and chagrin. He's rarely taken seriously as an authority figure because of his inexperience, idealism and boyishness — the others largely agree that he looks like a fourteen-year-old in a business suit. A child visiting the station once calls him "the little boy in the blue suit".
In episode 57, Dave tries to fool Andrea's polygraph test to make her think he's got a criminal record, but the test reveals he's never even thought about shoplifting, and Andrea calls him the cutest thing. He snaps back, "I am not the cutest thing!" and the polygraph goes off. Jimmy enters as Dave storms out, then Jimmy says to Andrea, "Ain't he the cutest thing?"
Minnesota Nice: Wisconsin. Despite the revelation of his technical Canadianness, there were many more Wisconsin jokes from the other characters over the course of the show.
Must Have Caffeine: When trying to get Bill to quit smoking, Dave gives up coffee at the same time to prove the point. They both fail.
Good with Numbers: A trait that gets brought up repeatedly. When the characters need to win Bill back because Jimmy Lost Him in a Card Game, they choose to teach Lisa the rules of poker rather than send someone who already knows how it works.
Only Sane Employee: She belongs to the cast of wacky characters Dave has to manage, but only through being a neurotic perfectionist and hardworking to a fault, which makes her about a mile saner than the next sanest employee.
Benevolent Boss: He tries, anyway. On one occasion, after realizing he got everyone really crappy Christmas presents, he tries it again a bit more personally, but apparently runs out of steam after giving Matthew some tapes of Fibber McGee and Molly and just buys everyone else brand-new Mazda Miatas; in a Double Subversion, it turns out that in addition to the tapes, Matthew got the rights to the show. He also sometimes appears to actively seek his good-boss reputation, by making Dave make the unpopular decisions for the company.
Crouching Moron, Hidden Badass: Jimmy James is not only deceptively intelligent but deceptively spry. When an ex-employee denounces him on-air, James dives across Dave's desk to hit the kill-switch button (done off-screen).
Lisa:(stunned) I have never seen you move that fast before. Jimmy: I save energy for times like this.
Dave: Lisa has decided that she wants to have a baby, but that she doesn't want to get married. Now I know that if you were awake you'd probably say something like, "Well, son, why milk the cow when you've got a fridge full of steaks?" And I would probably say, "That makes absolutely no sense, sir," and then you would say, "Well, it sure sounded like it made sense when that guy Chuck Connors said it in that movie Chinatown," and then I would be forced to say, "Sir, Chuck Connors wasn't in the movie Chinatown..."
Moe: She gets upset when Lisa is voted "cutest reporter" in a magazine, because "once they start calling pretty people cute, it devalues the whole word. What's going to happen next? Cute exotic people, cute sexy people? It is very important that the word "cute" remain precise terminology to the people who truly have cuteness, like me!"
Dave: Guess how many pieces of gum Beth chewed last year. Lisa: Seven hundred and fifty. Dave: One.
The Pirates Who Don't Do Anything: Unlike with Matthew, it remains clear what Beth's job was, but she can be spectacularly lazy about it. In the episode where Dave has everyone define their job, all she comes up with is that she makes coffee in the morning and sometimes in the afternoon. When he tells her to call a staff meeting in five minutes, she tells him to add "call a staff meeting in five minutes" to the list, then flounces out yelling, "Staff meeting in twenty minutes!"
Plucky Office Girl: In one DVD Commentary, the writers say they had to stop putting in references to how little money Beth made because instead of laughing, the studio audience would feel sorry for her.
I Have Many Names: After he's hired, Beth finds out that he worked at all his previous radio jobs under various aliases. When confronted about this, he appears to think it's normal to adopt a different persona with each new job.