Ben 10

Listen Carefully: The part when Dr. Animo's mutants come up, you can hear the bird from "Divided We Stand."

Look Closely
If the part where XLR8 is done cleaning his room and is about to speed off to do more chores is put into slow motion, you can see that the door opens by itself.

In the scene with the gym in it, JT and Cash said they were going to play dodgeball, but Cash was holding a basketball. As a side note, if you throw a basketball in dodgeball you might get your face hurt or head hurt.

Look Closely: When Cannon Bolt starts to roll, the lines on his back are thick black when he moves, but when he was in ball form not moving they were thin black.

The closed captions mistakenly read that the kid that screamed liked Cooper was said by Ben.

Think Back: We see Cash and JT pick on the same kid as in the first episode in the series, so the show came in a full circle as Ben gets embarrassed once again since he can't reveal his powers.

The episode was advertised as the LOST episode, but it's actually the LAST episode.

Think Back: Ben calls his parents Mom and Dad, but in Ben 10: Race Against Time they insist on him calling them by their first names.

Think Back: Everyone finds out about the Omnitrix in this episode, but in Ben 10: Race Against Time, it's still a secret. Maybe they are different endings?

Think Back: Ben tells his father that he slapped on the Omnitrix, but in "And Then There Were 10" the Omnitrix slapped itself on him.

Look Closely: Cannon Bolt's back turns white again in this episode.

Pay Attention: When Ben turned into Cannon Bolt, he didn't activate the dial on the Omnitrix.

Look Closely: For a split second after Ben turns into Diamond Head, Diamond Head's eyes are green.

Think Back: One of the students mentions he has "a first hand account of a plant-like thing saving a mall in Minnesota." However, in "Midnight Madness," the referenced episode, nearly all the customers in the mall were hypnotized by Sublimino, one of who incidentally looks like the kid.

Look Closely/Pay Attention: After Cash "throws" Jamie's drink at Ben, the tray of food Ben was carrying disappears.

Look Closely/Think Back: The incorrect American flag from "And Then There Were 10" returns in this episode.

Pay Attention: Ben's father (Carl) somehow knows how to operate the Plumber weapons.

Pay Attention: Ben's dog seems to recognize Ben, even in alien form. Such as when Cannon Bolt was stroking the dog, the dog didn't bark or bite or anything.

Look Hard: When Ben says "going hero" to Vilgax in the city, when he turns the Omnitrix if you look at the part where the alien silhouettes are supposed to be, it's completely blank.

Listen Carefully: When the kids are running away from the robots in the gym, you'll hear a kid scream like Cooper.