The bus which Skipper catches to go to the headquarters has Goosebumps (1995) print ads on its side, along with the recommendation: "Two thumbs up". See more

Goofs

Skipper spots the Masked Mutant's headquarters the first time he goes past. He then goes back the next day and the headquarters have vanished. He then goes back a third time, and the headquarters are not there yet again. However, Skipper says, "How can it be? It was right here yesterday." See more