As a Moments subpage, all spoilers are unmarked as per policy. You Have Been Warned.

Season 1

Episode 1: Wake Up

Reggie hands Rose a Sunset Curve t-shirt:
Rose: I'll make sure not to wipe the tables down with this one.
Alex: Oh, good call. Whenever they get wet, they just kinda fall apart in your hands.
Prophetic last words:
Reggie: Chill, man. Street dogs haven't killed us yet.
When Julie first sees the Phantoms appear out of nowhere she screams and runs away, which in turn causes the boys to scream in fright and grab onto each other.
- Julie later returns to her mother's studio armed with a crucifix, waving it in front of herself for protection.

The Phantoms' inability to cope with girls crying.
Luke: The only thing scarier than one girl crying, is two girls crying.
Alex: He's right.
Julie struggling to play off her saying goodbye to the Sunset Curve boys while Flynn is present.
Julie's dad comes into the studio talking to Julie's mom, and it takes Reggie a few minutes to catch on, assuming he's talking to the boys (and being very confused.) When he realizes what's happening, Luke comments "You're lucky you can play bass."
Learning the limits of their new abilities
Luke: I wish I had my guitar. [it appears] Whoa!
Reggie: That was rad. How'd you do that?
Luke: I don't know. I-I-I mean, I wished for it, and then it came in my hands...
Reggie: I-I-I wish I had a puppy. ... A hamster?... Pizza?

Reggie gets up on stage and does a strange butt wiggle to see if the audience can see them when they aren't performing.
Reggie: They can't see us.
Alex: I wish I couldn't see you.
Alex freaking out upon learning that he can be seen by lifers if he plays music with Julie.
Alex: My clothes are made of air, but for some reason, I'm still getting a wedgie.
(everyone looks at him)
Alex: So many questions.
Luke's ridiculous face while imitating Julie's downcast look.
The janitor seeing Julie talking with thin air and deciding to just brush it off.
The boys are so hopeful - and helpful
Reggie: Later, Julie. Oh, tell those cheerleaders I'm single.
Alex: Oh, and that he's dead.
Reggie: Oh no, no, no! Leave that part out. Leave that...
The guy in a dog suit suddenly sitting next to Alex while he is chatting with Willie. Alex is briefly creeped out until he sees that the guy is about to have lunch. And when Willie leaves, Alex starts gushing to the guy about how cute Willie is, forgetting that he's still invisible.

The Imagine Spot Julie has at the beginning is unceremoniously ended when a marching band boy tells her to return the drum sticks that she unknowingly took.
Flynn asking Julie about the Sunset Curve.
Flynn: So, how's the band? Still hot? Still talented? Still dead?
Reggie wrote a country song titled "Home is Where My Horse Is" and slipped it into Luke's lyrics journal. Luke calls him on it and Reggie insists "That was a gift!"
Carlos has realized the house is haunted and decided to become a ghost hunter. After declaring the studio clear (much to Julie's amusement), he pulls out a box of salt to chase any ghosts away. The boys are noticeably freaked out, when some lands on Alex he screams and doubles over, then immediately stands up just fine.
When Willie comments that Alex is "wound pretty tight."
Alex: I've always been a little anxious, and then I died. Which did not calm me down.

While at the club, the boys do a little catching up on pop culture:
Reggie: They made eight more Star Wars movies, and they killed Han Solo? What kind of future is this?
Luke: We found out, like, two weeks ago, OK? We just didn't have the heart to tell him. But just please don't mention Jar Jar.
A few minutes later...
Reggie: You guys are not gonna believe this, but someone just told me they added a character named Jar Jar. What's a Jar Jar?
As the boys are leaving the club:
Caleb: Until next time. (smirks and chuckles sinisterly)
Reggie: See you round. (also smirks and chuckles sinisterly)
Alex: (smacks him) Dude!
Reggie: What? That's what he just did!

After Alex and Reggie get hit by one of the painful jolts:
Reggie: It feels like that time I was fixing my amp in the rain!
Alex: (looking alarmed) You shouldn't– ...okay.
Luke's handwriting leaves much to be desired.
MC: OK, it looks like we're closing the night out with one more group, "Julie and The Fat Ones."
Alex: Really?
Luke: Yeah, man. My handwriting sucks.

Reggie scaring off Tía Victoria. Carlos, who is positively giddy that his belief is vindicated, tries to take a photo of the "haunting" but ends up snapping a selfie of the scared Victoria instead.
Luke trolling Julie while Nick is hitting on her.
Nick: It's a good thing I got my secret weapon.
Luke: Uh-oh! I think somebody has a crush on Julie.
Julie: Shut up. (realizes that Nick doesn't see Luke) Um, shut uuup!
Flynn tries to dissuade Julie from crushing on Luke.
Flynn: Tonight, you're performing with Luke. So the key is avoiding those big, beautiful, dead, eyes.
Luke tries to prove that he has chemistry with everyone he sings with by serenading Reggie, all while touching him on the back of the neck and gazing deeply into his eyes.
Reggie: (very flustered) That was pretty hot.
(Luke kisses his fingertips and brushes them against Reggie's lips. Reggie looks stunned.)
Reggie: (clears his throat) ...Girls, am I right?
Luke: Yeah.
Alex: (smiling) No.

Tía Victoria is still scared of going to the Molina house.
Carlos: I'm telling you, tía, it was a win-win. The ghost is gone, and me and Dad got a killer French dip sandwich.
Victoria: But how you do know that the ghost is really gone?