Spy Kids (2001)

Continuity mistake: When Juni handcuffs the metal box to his wrist, it switches back forth from his right wrist to his left over and over again. (00:35:05)

Revealing mistake: After Carmen rescues Juni, as they fly over the city she says, "Hang on butterfingers." In the following close-ups, where is the handcuff with the broken chain on Juni's wrist? He is not wearing it on either wrist in any of these close-ups. It's obviously back in the following shots. (00:41:45)

Super Grover

Continuity mistake: Lifejackets appear magically on the two kids when they emerge from the inside of the weird bubble ship. When they re-enter, they magically disappear. Likely, they simply didn't want the actors to be on a boat without a lifejacket, but there could've been a more graceful way to do it. (00:22:50 - 00:24:05)