I have a few, but I'll start with this little animation which has bugged me since I was 7:

Fall down ya bastard! Stop breaking the laws of physics! :angry:
I had to get that out of my system. I feel better now.

Alvin has four close friends. Freddy, Sam, Mitch, and an unnamed one. Freddy is the short talkative one ("Hey Sattelite Boy!") and Mitch is the one with no neck (wants to be a Private Eye). The other two are in dispute - one has a mop top of hair covering his eyes, the other has a huge chin and donut lips. In Save The Classmate, Alvin calls the one with a big chin Sam, yet in The Hijacked Airship, Daddy Walrus calls the mop top one Sam.
Okay, so that's kind of obscure...

In The Red Cat, Daddy Walrus specifically says the year is 2031. Yet in The Wreck of The Titan, they find a ship from 1990 and say it's 30 years old, putting the date at 2020. The Red Cat episode came first so 11 years didn't pass, and I'm pretty sure Astro's entire class aren't midgets who were held back in school.

In Atlas Forever, when Astro is recovering in the rescue centre near the UN building, he gets a call from Captain Kili. Astro interrupts him to say "Oh!" and his voice is filtered to sound like a radio transmission along with Kili's. Sounds like they forgot to cut back to regular audio.
OMG I sound like the Sci-fi nerds who get paid out on The Simpsons...
Professor Frink: Yes, over here, n'hey, n'hey. In episode BF12, you were battling barbarians while riding a winged Appaloosa, yet in the very next scene, my dear, you're clearly atop a winged Arabian. Please do explain it.
Lucy Lawless: Ah, yeah, well, whenever you notice something like that, a wizard did it.
Professor Frink: I see, all right, yes, but in episode AG4 --
Lucy Lawless: Wizard.
Professor Frink: [under breath] Aw, for glaven out loud.
Nnn'hey!
