The Danza: In TY2 and 3, Gooboo Steve is voiced by creative director Steve Stamatiadis.
No Export for You: While the first two games were released worldwide, the third game never made it to Europe.
The Other Darrin: The voice cast has changed between games. While characters such as Maurie, Dennis, Boss Cass, Fluffy, and Rex have the same voice actors throughout the series, others, including Ty, Shazza, Sly, Ranger Ken, and Julius, have different voice actors, with Shazza and Sly being egregious examples, as they have a different voice each game. Ty, in particular, was voiced by veteran video game voice actor Greg Ellis in the second and third games.
What Could Have Been...: The second game was originally going to have a time travel plot, Betty and Duncan were a younger Di and Bri, and Karlos was supposed to be an older Julius. Probably might explain the dinosaurs.
There was going to be an animated series by Film Roman, but nothing has been heard of it since its announcement in 2004.