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H.G. Wells will be burying a time capsule, and the students have to place one object of their’s into the capsule, which won’t be dug up for years to come. Lloyd notices the things that are going into the time capsule and realizes that on a date with Barbara, he and she found a time capsule, which they dug up and went through. He realizes that if they write a letter and place it in the time capsule telling their future / past selves not to buy a time machine, they will have never left the future, and thus would be home. Everyone is excited, though Phil knows that if he never went to the past, he would have never met Keely, and all of his memories about her would be gone.
In a hundred years, H.G. Wells Jr./ Sr. High School was torn down and replaced with a park. When this change occured is unknown.
Although they are stuck in the past, according to the end of this episode Barbara and Lloyd were both originally from a future Pickford.
Scientifically, if something is engraved (or in this case, printed) on a tree near its trunk, especially at the base, it will stay the same height above ground, no matter how tall the tree grows, even in one century.
Did the family rent or buy the time machine? According to the theme song and the promos that preceded the premiere of the show, the family rented a time machine. But according to this episode, Lloyd bought the time machine from a store that sold used time machines (and water slides) while he and Barbara were dating. So which was it?
When the flashback is shown of Lloyd and Barb's picnic, it was supposed to be taking place when they first started dating. However, they are both wearing wedding bands in these flashbacks.
If the note were read and the advice followed, it would’ve created a time paradox. The Diffy's wouldn’t have gone to the past; thus, the note wouldn’t have been written. If the note weren’t written, things would be how they are, with the Diffy's in the past, writing the note.