In this episode it features when Timmy first got Cosmo and Wanda when he accidentally reverts all the way back to their first meeting. This scene is done in main series style, as opposed to Oh Yeah! Cartoons style.
The scene when Timmy's parents leave to read bedtime stories to underprivilaged, confused dolphins, and Timmy's Dad tells Timmy what story they're going to read has been parodied many times on Youtube, where the dolphin sound is replaced by numerous other sounds.
This episode affects the whole Time/Space continuum.
Vicky said the title of the episode in one scene.
When the episode ends and the black ring comes in, it has re-do one last time, sending the viewer (not literally) back to before the black ring came in.
The title card is a play on M. C. Escher's painting "Drawing Hands", a situation that resembles an infinite loop.
Timmy and later Vicky re-doing things with the watches.
Timmy re-doing something that does not go right. (water balloon, test result, etc)
After Timmy successfully does something almost impossible, a large group of people appear stating they got word on the street that he is the best at something at his school. They then reveal that they are the best at said something in the other schools and they all want Timmy to do something with them (i.e. the bullies all wanted a piece of Timmy causing the latter to bark like a wiener dog). Timmy will then re-do to get out of the situation.
In some scenes, Timmy doesn't have the watch.
Redo means applying the action after, and undo means fixing a mistake that was done before
On a scene where Timmy tries to throws a water balloon to Francis, Timmy throws the balloon at someone in Paris which is somehow impossible as Timmy did not enchant the water balloon so that it could be thrown that far.
When Timmy's Dad says: "We're going to read the little doplhin who cried..." the animation on Mrs. Turner's head is failed.
Word of the Episode
"Re-do!" is said by Timmy, Vicky, Cosmo, and Wanda, to refer to the re-do watch's effect.