Creator's Pet: Chett. The producers liked Lee Tergesen's Large Ham performances so much that they started writing bigger and bigger parts for Chett, eventually making him a Secret Keeper at the end of Season 4 and devoting much of Season 5 to him.
"Funny Aneurysm" Moment: In "Slow Times at Farber High," Gary accidentally takes away the intelligence of most of the people at the school. Scampi ends up too stupid to open his own office door, so he thinks he's trapped. After repeatedly failing to escape, he laments that he's going to die on the floor of his office. That's actually what happens to him in the Grand Finale.
Growing the Beard: Starting in the second 13-episode season (when Wyatt's hairstyle changes) the writing improved considerably, moving away from the premise of the movie toward more fanciful magic and sci-fi adventures, and giving Chett more to do than just be the Butt-Monkey.
Harsher in Hindsight: One episode, Wyatt's wish to become president of the chess club gets twisted into his getting THE Presidency instead. And then one of his first briefings involves learning about national security over the then-recent attack on the World Trade Center, that includes them saying they don't want to be caught off guard again. Wyatt interrupts it instead to talk about the matter of his school's chess club president.
Heartwarming Moments: At the end of "Grampira," Wyatt and Gary (who, thanks to Wyatt's Nana's Vampiric Draining, have essentially become old people trapped in young people's bodies), bring Nana back to her nursing home to reverse the spell and restore their own youthful energy. Nana not only readily agrees to go back, but tells Wyatt that being young once was enough for her—she's lived a long, happy life, enjoys her retirement, and especially likes to spend time with her grandchildren. The episode ends as Nana eagerly greets her also-retired friends, and Wyatt smiling as he watches her.
The guys need to use Frankenstein's equipment and the help of the Creature himself in "Searching for Boris Karloff" in order to save Lisa:
Wyatt: Lis, I don't know if you can hear me, and I know we don't have the slightest idea what the hell we're doing, but we're still gonna try. And if... if it doesn't work, I just want you to know that the best wish you ever granted us was being our friend. [to Gary] You okay? Gary:Yeah, yeah. Something in my eye. Creature:Mine, too.
In "Gary Had a Little Cram," Gary finds Wyatt and the other seniors have already applied to colleges and gotten in, so he struggles to catch up and beef up his record. Helping him out, Wyatt talks up the merits of the school he applied to (Paxton University), but Gary doesn't care about that.
In "You'll Never Eat Brains in This Town Again," while trying to coordinate a stunt, Chett kicks a zombie's head off - except he thought it was just a student actor and subsequently thinks he killed someone. While trying to bribe Wyatt into not testifying against him, a panicked Chett exclaims, "I can't go to prison!" Turns out, he did go to prison.
In the second episode, Wyatt and Gary get a hold of a universal remote that allows them to control time. Sounds familiar.
Signature Scene: Lisa's first appearance and first words: "So, what would you little maniacs like to do first?". This is the scene most frequently parodied.
Strawman Has a Point: Gary's father. Even a liberal parent would think more than twice before letting his/her 15-years-old kid go to a party so vividly (and without a slightest trace of irony) described by Lisa. She does it in a Trolling way, even if she's telling the truth.
It's unlikely that the scene where Lisa threatens Gary's parents with a squirtgun resembling a real gun would be perceived as funny by modern audiences as it was in 1985.
Scenes of the two boys, who are 15 and don't even have learner's permits, driving recklessly and/or drunk are played for comedy. The increased attention on reckless driving since the film's release make these scenes a lot less precocious and more wildly irresponsible.
Gary heroically calls the evil bikers a bunch of faggots, a term that has become a slur rather than an insult since the film's release. The film does, however, remove the implications of homosexuality from Wez that he had in The Road Warrior.