Trivia: The episode starts off with Dee Dee eating scraps, while Marky looks over stuff. Later on, Marky found what seems to be an Identity Card that belongs to Joey. Here, the card shows that Joey's birthday is on June 15th, 1991. (00:00:14)
Suggested correction: Is there some sort of special offscreen significance to this birthday? Because I don't see how this constitutes trivia if it's blatantly shown onscreen.
It counts as a trivia because no characters except Joey have their dates of birth revealed.
I mean, unless I'm lacking some sort of other context, I still don't think just seeing a character's birthday counts as trivia, unless the date is some sort of inside joke or reference.
Trivia: It is unclear whether Jack is Oggy's cousin or friend, but in the episode "Love and Kisses" (S2E81), it was shown that Jack instantly fell in love at first sight with Monica (Oggy's Sister), which tells us that Jack is indeed Oggy's friend. Making him Oggy's cousin would be considered as cousin marriage.
Trivia: Throughout the whole series, Oggy's house contains various disproportional rooms inside of it. For example, the living room inside of the house is literally twice the size of the house alone. What's hilarious is that Oggy used the living room only to watch TV.