In the hospital scenes, Beast wears a Howard The Duck shirt.
Cameos: Yuriko, Sabretooth & Deadpool when the Professor's dark side attacks Wolverine.
When Professor Xavier is speaking with the X-Men in the alley before heading to Muir Island, a "FOX" poster can be seen on the wall. The series originally aired on Fox Kids Network.
First appearance of Banshee (Sean Cassidy).
Lilandra Neramani makes her first unmasked appearance to Professor Xavier on Muir Island.