Other mistake: When Butch says "Welcome to HQ", his mouth isn't being animated.
Other mistake: When Mr Tinkles & Co are in the car outside the flocking factory, you see them speeding around the corners wildly, but if you look on the floor there are already treadmarks from previous takes.
Answer: Butch was abandoned. It's never stated but it's implied.
Ssiscool ★
"Okay, well, here's lesson number two: we help them. We work for them. We tolerate that stupid boochy-boochy baby talk. And for WHAT? So that when they go off to college, they can dump you off with some old lady who can't throw a ball without so much as breaking her HIP!" Pretty sure this counts as being abandoned.
As I said, it's never stated outright but it is implied.
Ssiscool ★