When Skipper looks for the Masked Mutant's headquarters the second time, the original comic book used for the shot can be seen as he holds out the comic to show the old man, with the original Punisher cover becoming visible as the Galloping Gazelle cover falls off.
The Skydome and CN Tower can be seen behind the Masked Mutant's lair, even though the episode is supposed to take place in "Tarrington".
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."