The Ice Castle Arcade is a time machine.
The Ice Castle Arcade in Backyard Hockey 2005
has retro-style arcade games. Many of the characters say in the first game that the series takes place in the present day. Since the heyday of arcade games was in the 1980s, and most of the pros were children at that time (like they are in the games), isn't this a possibility?
Sunny Day frequently forgets people's names.
This is the reason for the Mad Libs Dialogue
— she keeps having to read the names off of cue cards. Her co-commentators tend to ad-lib, so they don't have the same problem.
The generic filler kids in seasons are seen through the eyes of the Backyard Kids.
The Backyard Kids don't know these people very well, so they are shown through their perspective. They all look the same to the Backyard Kids, so that's what they look like to us. It is a possibility, right?