A billboard seen during the baseball game advertised the 1998 Winter Olympics, which took place in Nagano, Japan 4 years after the episode aired.
When Felix picks players for his baseball team, his voice sounds very different from usual.
Max: Hang onto your seats, Beatle fans! It's a rock 'n' roll concert!
Bea: You've got the rock 'n' roll part right!
Max: You can't fly a plane.
Bea: Why? Because I'm a girl?
Max: Because you don't know how.
Bea: Yes, I do. My mother taught me.
Virgil's means of summoning: While playing a baseball game, Max sees a blimp fly by that has "Portal at ski jump" written on the side. When Bea runs into Max trying to catch a fly ball, they fall into a portal in front of a sign that shows a skier jumping.
Beetlebrow was a monster from the Horror Heads line of the Mighty Max toys.