Mention all the similarities between "101 Dalmatians" and it's sequels (The starlight barking, 102 Dalmatians, Patch's London Adventure) that you notice. I'll start with a few of them:
Dog's collars:
101 Dalmatians: Pongo blue, Perdita red (live action movie)
102 Dalmatians: Dipstick blue, Dottie red
Main puppy characters:
101 Dalmatians: Lucky, Rolly, Cadpig (the series)
102 Dalmatians: Little Dipper, Domino, Oddball
Bird pretending to be a dog:
101 Dalmatians: Spot (the series)
102 Dalmatians: Waddlesworth
Cruella's pet:
101 Dalmatians: a white persian cat (the novel)
102 Dalmatians: Fluffy
Cruella's henchmen:
101 Dalmatians: Jasper and Horace
102 Dalmatians: Alonzo and LePelt
The furrier:
101 Dalmatians: Mr de Vil (the novel)
102 Dalmatians: Jean Pierre LePelt
"Poison them, drown them, bash them in the head":
101 Dalmatians: said by Cruella
Patch's London adventure: said by Jasper, Horace and Cruella
"white rat":
101 Dalmatians: newborn Lucky
102 Dalmatians: Oddball
Cruella gets dirty:
101 Dalmatians: in molasses and hay
102 Dalmatians: in a cake
"But we are not a bit sleepy yet"
101 Dalmatians: said by Patch, after watching Thunderbolt
Patch's London adventure: said by another pup, after watching Thunderbolt
Now tell us some similar things that you spotted.