Jerry Stiller and Anne Meara voice RVs 'Harvey' and 'Winnie' who are celebrating their 50th wedding anniversary in Piston Peak National Park. Stiller & Meara celebrated their 60th wedding anniversary in 2014, the same year the film was released.
The "red stuff" being dropped from the airplanes is Long Term Fire Retardant called PHOS-CHeK. It has been used by the US Forest Service for 50 years and is used to create a containment line around a wildfire. It is dropped as a liquid and will remain effective until it is washed off by heavy rain. The red color is used so pilots can see where to drop the next load to tie in with the line of previous drops.
"CHoPs" (about the California Helicopter Patrol) is a parody of CHiPs (1977) (California Highway Patrol). Blade's erstwhile partner 'Nick Lopez' is voiced by 'Erik Estrada' who played 'Ponch' in "CHiPs". Both Ponch and Lopez used "Seven-Mary-4" as a call sign. Both "CHiPs" and "CHoPs" lasted for 139 episodes (in the hangar 'Dipper' describes the show as "139 episodes of law-breaking love"). The logo font and theme song from "CHiPs" are used for "CHoPs."
The train that brings campers into the park has the name "Muir" on its side. John Muir was a naturalist who wrote many books and poems about his time in the Sierra Nevadas. He was also the founder of the Sierra club and is thought of as the "Father of the National Parks."
The Piston Peak fire truck character 'Pulaski' is named after a fire fighting hand tool of the same name. It is part axe and part hoe and named after its inventor Ed Pulaski.