First episode: Dr. Oliver questions his own priorities as a robot T-rex approaches his jeep. "Yeah, lock the door, Tommy, real good!"
Ethan being as brilliant as always.
Ethan: I was just trying to give you guys heads up. Stuff happens out there. So don't come crying to me when you fall into giant sinkhole.
The trio takes another step before falling into the underground tunnel that leads to Tommy's dino lab.
Also, when they find their eventual base:
Conner: Reminds me of Goldilocks and the Three Bears. Ethan: Is that the last book you've read?
When Ethan, Conner and Tommy are looking for Kira in the second episode he grumbles that "she's not just gonna fall out of the sky and land right in front of us". Cue Kira doing exactly that. Granted, it was because she fell into the villain's Portal Network, but you have to admit, the coincidence of that happening is very funny!
Ethan tries to invoke this again in the finale. It works. Guy should watch his mouth.
Tommy's victory dance after the team's first battle with the Dimetro Zord. Refreshing to see the Breakout Character being allowed to act like a dork now and then.
Conner: Who would believe a combination bear, mushroom, and ATM machine?
Kira: Is it really any stranger than the things we've been fighting?
Conner's first response to it? "This is wack." And his reaction at one point while blocking the TV by holding his jacket open: "THIS IS WHAT THEY THINK OF US, IN JAPAN!"
And the whole "Wiggy Rangers" bit. "And my hair has bounce!"
We can't forget the one ("Leader of the Whack") where an Applied Phlebotinum reverses the trio's personalities and turns Conner into a nerd, Kira into a dainty Alpha Bitch and Ethan into a Jerk Jock...
And Devin into a ladies' man... or, what Devin thinks a ladies' man is, at any rate...
Arguably the funniest part is Kira doing a very dainty cheerleader-style bounce during her morphing call, to the point that the second time she does it, the camera focuses mostly on her.
Hunter (hanging on to him): Did you seriously just say that?
Plus, the very end of the crossover as Marah passes by Cassidy, each admiring the other but a split-screen showing both saying "I'm so much prettier." The funny? Both characters are played by the same actress, Katrina Devine.
The end of "Copy That", when Trent apologizes for his behavior before the evil was removed from his Dino Gem, Kira states a bogus rule that all newbie rangers have to wash the 30-story-tall zords, while Conner and Ethan go along with it, handing him a bucket of cleaning supplies.
Marty the Mackerel. I ask you, is there anything more pathetic than a man in a giant fish costume dancing and singing badly off tempo?
Conner and Ethan snooping around Tommy's house. Conner decides to play around with a model T-rex skeleton. Ethan tries to warn him not to. His response:
Conner: Dude, the guy's a teacher, not... *flicks a switch revealing a secret door* Batman.
In Truth and Consequences, the trio plan on how to find out who is the White ranger while in Cyberspace caffe. Conner notes that they should head outside as it's unlikely that he will walk in just like that. Trent enters the room.
Actually, it happened to Trent twice, in the same episode even. When he is out in the woods, he hears Cassidy and Devin talking about how the White ranger definitely lives alone in a cave somewhere in the wild. After Trent accidentally makes some noise, Cassidy (who can't see him) calls out to him as so, but relaxes when she spots him as neither she knows the truth.
In Ranger Exclusive, the team arrives at location currently inhabited by a MOTW. Being aware of the presence of White Ranger clone, Conner says he is going to look for the white dude. Trent gives him an annoyed look. Conner corrects himself by adding evil to the white dude.
The gang spends a good chunk of "Disappearing Act" helping Ethan prepare for his date with Cassidy. Kira helps sort out his wardrobe, Trent gives him a crash course in high society dinner etiquette, and Conner of all people teaches him ballroom dancing. Their efforts prove to be unsuccessful, and Ethan ends the day feeling like a nervous wreck. He eventually settles for a mostly simple picnic, which the teens and an invisible Tommy spy on using the lair's computer. It starts off well, but when Ethan inevitably takes their advice ("Just be yourself.") a little too literally, they're dismayed in the most hilarious ways possible.
Conner: No! I specifically told him not to go into geek mode!
They later find that Tommy has left them- not out of mortification, as one would initially assume, but to save Ethan's date. Poor Ethan is more baffled than ever when the candles suddenly get re-lit and a bouquet of flowers appears out of nowhere.
After Elsa blows her cover, she and Tommy end up kung-fu fighting in broad daylight and in front of all their students. Just imagine walking between classes one day and seeing your principal and science teacher battling to the death.