A common occurrence in television series, especially animated series, is for there to be inconsistencies and mistakes when it comes to animation, plot, and even promotional material. 101 Dalmatian Street is no exception, as it features multiple errors:
In a close-up of Dylan eating his kibble, he is inexplicably wearing a space suit (in addition to his usual space helmet) that disappears in the next shot. (Oddly enough, this suit appears to only exist in Dylan's imagination, as seen in "Space Pups" and "Who the Dog Do You Think You Are?")
"Perfect Match"
In a wide shot near the end of the episode, 99 and 103 Dalmatian Street have swapped places.
When the Dalmatians arrive to rescue Diesel, the spots over the Dimitris' eyes are all the same. Usually, they have different numbers and assortments of these spots.