A Noticeable Continuity Error
There is a noticeable continuity error in the original series, and it exists in 2 of the 3 "flashback" cartoons that deal with the beginning of the CLIFFORD "saga": the residents of Birdwell Island meeting Clifford and the Howards for the first time and the building of Clifford's giant dog house.
In the flashback where everyone meets Clifford for the first time, there is a brief "shot" of Clifford waking up in his giant dog house already built and then running when Emily Elizabeth called him.
Then, in the building of the doghouse flashback, it is clear that the doghouse was built BY the residents of Birdwell Island who love Clifford and wanted to do something nice for him after all he's done for the community.
So since we know that the dog house was built by the people of Birdwell Island out of love and appreciation for him, then how could it ALREADY be built before everyone got to know him?
Despite this continuity error, I still enjoy the cartoon and consider it one of the best modern-day cartoons ever made.