Smurfette is seen on the VHS cover of the special, however she does not appear anywhere in the special, yet Michelangelo appears in the special but is not shown on the cover.
During the encounter with Michelangelo of the Ninja Turtles, Smoke's dialogue has no lip-sync animation.
Some of the cartoon characters are explained as being in "the real world" by being represented as toys that magically come to life, or as characters on a comic book page, but several others simply show up in their cartoon form with no explanation whatsoever.
In the series "Smurfs" Briany's eyes were always close whenever he looses his glasses as he couldn't see without them, but when he looses his glasses, his eyes were wide open and he can see where his glasses are to pick them up.