Revealing mistake: During the attack of the Global Sedition on the space station at the beginning of the film, several objects can be seen with dark grey boxes around them - CGI artifacts. One clear time is when Ranger 1 is saying "Damn, can't shake him". (00:02:35)
Revealing mistake: When Penny and Blart are reunited at the end, the animators didn't put the creature where Penny is looking. She also tries to lift it onto her shoulder, but it is nowhere near her hand.
Answer: Presumably, they're still "Lost In Space." The series ended before a final episode was shot. In the 80's, series creator Irwin Allen considered doing a TV reunion movie with the original cast to bring the Robinson family home, but with the unfortunate passing of Guy Williams, the idea kind of fell to the wayside.