Revealing mistake: After Sam shoots Spencer with her blowgun, she lands on the ground after jumping from the ceiling. During this shot, you can easily see that it is a stunt double.
Revealing mistake: Carly, Sam and Shelby all corner Nevel in the ring. If you look in the corner where Shelby shows up, she's not in that corner until the light flashes on her.
Revealing mistake: It's very obvious that Carly's grand-dad is a stunt double when he does a handstand in the record attempt episode.
Revealing mistake: When the gang is "Messing with Lewbert" and they zoom in on his wart, you can easily see it is just makeup.
IWanna Stay with Spencer - S1-E5
Revealing mistake: When Spencer turns on his iPod when talking to his Grandpa, you can see that the headphones are not plugged into the iPod.
Suggested correction: It is plugged in, but the cord runs from Spencer's head under his shirt and meets the iPod near where Spencer's green short sleeve shirt meets his long sleeve white sleeve shirt. Only a very short bit of the cord appears from under Spencer's sleeve to the iPod strapped to his arm.
Revealing mistake: During the shot where Chuck flips Spencer for a brief second you can see his face, which reveals that it's a stuntman as he is a different person.
Revealing mistake: When Carly's in her dream and attempts to use the elevator, if you look really closely, she doesn't actually hit the button that lights up.