Dinosaurs

This is Land of the Lost (1991), a remake of the classic 1974 series of the same name.

A family are vacationing in their Jeep Cherokee and fall through a portal into the land of the dinosaurs. Hijinks ensue in a vain attempt to get you to buy plastic tat for your children*.

It featured the Porter family - father Tom, son Kevin and daughter Annie - trapped in a parallel universe after their Jeep Cherokee fell through a time portal while exploring the back country. They soon meet another human, a "beautiful" jungle girl named Christa who came from 1960s San Francisco. Christa became trapped in the Land of the Lost when she was very young and grew up alone (an earlier concept would have featured an adult Holly Marshall as the "mystery girl", along with Cha-Ka, but, due to casting, the characters were revisualized as Christa and Stink).

The Porters live in a large "treehouse" (although it is actually built between a series of large logs and not rooted trees) that the family built after they realized their tents provided little safety from dangerous dinosaurs. After their first encounter with the Scarface, they devised an alarm system by stringing up a series of empty tin cans surrounding the treehouse perimeter that would shake and make noise if Scarface were to show up again.

*Accessories sold separately. Batteries not included. Not a flying toy