Goof: At the end of the episode when Lloyd thinks that his family disappeared he should have realized that they didn't because if they did he would have no memory of them and he wouldn't be in the present, he wouldn't have still been in the future. With no family, he wouldn't have taken a "FAMILY" vacation.
Goof: Barbara says that the Speckles have only been in the U.S. since the early 21st century. If Kyle has only been in the U.S. for such short time, why does he have no trace of a foreign accent?
Keely: Phil, he's telling the truth. He's not going to do any more pranks. What are we going to do?
(Phil starts disappearing and reappears again)
Keely: Okay, you're really freaking me out.
When Phil and Keely ask Pim for help, she is acting out the famous scene from the godfather. She even talks like Marlon Brando's Character Don.
The way Phil couldn't talk to his great-great grandfather was like in the episode of Futurama titled Roswell that Ends Well when Fry goes back in time and meets his own grandfather and cannot interact with him or else he wouldn't exist.
The moment Phil steps in to take the blame over Kyle's (his great-grandfather) misfortune, he altered history by preventing Kyle from meeting his future wife at military school. This was very similar to the 1985 film, Back to the Future, where Marty McFly travels to 1955 and does the same; although he prevented his teenage dad from meeting his teenage mom. In other words, both scenarios involve a "ripple effect" inflicted upon them.