The spoons that the psychic Pokémon and trainers have and bend is a reference to the charlatan psychic Uri Geller.
When Pikachu fills the stadium with lightning to negate Abra's teleportation, the striking sound effect is from Back to the Future (1985) when the DeLorean travels through time
This is the only anime episode to date to feature a warp tile.
Ash and his friends finding themselves in a dollhouse may be a reference to the The Twilight Zone (1959) episode Stopover in a Quiet Town (1964).
This is the first episode in which Ash challenges a Gym Leader and doesn't get the Gym Badge later in the same episode