In the scene where Ash you ask to Officer Jenny, believe is the same from Maiden's Peak, but she he answers that we are cousins, a reference from the previous episode Ghostly Pokémon and the Summer Festival (1997).
In the scene where Ash looks the Arnold's mother, reminds you her mom Delia Ketchum and appears a flashback from the censored episode Aopuruko no kyujitsu (1997).