In an episode featuring Hayley Kiyoko, Luther goes up to her, takes a whiff of her hair, and says it smells like lemons.
Hutch Dano (Zeke) also had a role on The Suite Life on Deck as Moose, Bailey's ex from Kettlecorn and in one episode of Zeke and Luther he is found shedding corn and he says, "What, I shed corn when I am stressed" and on the The Suite Life on Deck he also sheds corn.
Brother Chuck: Olivia completely disappeared following "Adventure Boy" and no mention has been made at all of her since.
Broken Aesop: In "Cup Stacking". So, if my best friend shows talent in something that doesn't interest me, I should find his friends and scare them into abandoning my friend so he'll come crawling back?
California Doubling: For California itself. The show repeatedly points out its setting in Gilroy, CA (a town at the southern end of the Bay Area), but it's very obviously filmed in SoCal.
Catch Phrase: Ginger repeatedly calls Zeke and Luther "pit-sniffers". In return, Zeke usually calls Ginger "mini-munch."
Ginger also tends to say "Oh yeah, baby!" when things are going her way.
Also, Kojo's "Watch out!" accompanied by a butt-slap.
In one episode, a guy talked about stuffing bananas in his Wedge-o-Matic.
In "Adventure Boy," when Kojo is trying to teach Zeke girl-grabbing tips, one of the hooking lines he uses is, "Your lips look kinda cold. Let me warm 'em up for you." While he could be talking about kissing, he could also be talking about sex. (Lips are also a name for... never mind.)
The Ghost: Zeke's parents are mentioned but noticeably absent, even when the plot clearly calls for them.
Also, the B Plot of "Luther Leads" started with Ginger finding a Golden golf ball inside a donut and thus being named heir to the donut shop. She was eventually refused because she couldn't stand training or donuts and intended to tear the place down and erect an office building.