Audio problem: When the boys leave, Wilma says "Drop in some time to say hello" in Betty's voice.
Audio problem: When Barney says "You're about two feet too short" when Fred steps onto the scales, his mouth does not move when he says "short."
Audio problem: At the bowling alley, there is a red haired man who is initially voiced by Alan Reed, but when he says "Hey guys! Did you get that?", he is voiced by Mel Blanc.
Audio problem: When the man living in Barney's house says, "Yeah, struck it rich in oil years ago!" to Fred, his voice is completely different to the one heard when he opens the door.
Answer: The name of the pet is "Baby Puss." He has appeared in episodes, but only a very few. The first episode was probably "The X-Ray Story" from season 2.
Bishop73