Timmy Turner's greatest fear is Vicky (obvious since he faced her a lot), Molly fears snakes (either because of their scary appearance or because of a fear of getting a snake bite), and Dwight fears harpoons. (because of a dream about him being a whale and everyone wanted his blubber during it)
Apparently godchildren are not supposed to overwish too much as soon they will become dependent on magic to help themselves and overwork their godparents.
Jorgen apparently can tell when someone overwishes way too much since when Timmy wished for the ski resort and the chocolate ski board and was about to go for a joyride he suddenly appeared in front of Timmy to stop him and take him to Wishing Well.
Timmy making a wish that either tires or hurts Cosmo and Wanda, but both him and Poof are enjoying the said wish.
Timmy, Molly, Dwight being smacked in the face with a fruitcake whenever they say "I wish".
Jorgen stating to the kids that he will give them a hint about what they are going to do next, but he unintentionally reveals the entire thing about what they are going to do next and he makes a comment about giving away the answer instead of just saying the hints.