For convenience, I'm going to try to make a comprehensive list of all the JumpStart playthrough videos I've found so far. They're pretty easy to find on Youtube, but I thought having links to all of them in one place would make them even easier to access.
JumpStart Adventures 3rd Grade: Mystery Mountain - Part 1 - Part 2 - Part 3 - Part 4 - Part 5
JumpStart Adventures 4th Grade: Haunted Island - Part 1 - Part 2 - Part 3 - Part 4 - Part 5 - Part 6
JumpStart Adventures 4th Grade: Sapphire Falls
JumpStart Adventures 5th Grade: Jo Hammet, Kid Detective - Part 1 - Part 2
JumpStart Reading for Kindergartners
JumpStart Math for Kindergartners
JumpStart Reading for Second Graders
JumpStart Math for Second Graders