When Time Slime has the gang tied up under the Killer Clock, he says that the machine will kill them, but when Scooby is shown the future, the whole gang (except for Bernie) is shown to be alive and well.
In the future segments that Scooby and Vincent Van Ghoul witness, Daphne, Flim Flam, and Shaggy definitely appear older. But other than a leather jacket, shades, and a very bad attitude, Scrappy didn't seem to grow up at all. Even Weerd and Bogel look older despite the fact they're already ghosts!
Title and Plot:
"It's a Wonderful Scoob" is taken from the title of the classic Christmas movie "It's a Wonderful Life." Meanwhile, the episode's plot seems to be based off of a combination of "It's a Wonderful Life" and the Charles Dickens book "A Christmas Carol."