Goof Troop's episodes have run the gambit in terms of story, animation, and characters, from all three being very good to where one or more, for lack of a better word, suck. This one, fortunately, excels in all three, as well as a fourth, music.
When Max and PJ see a TV ad for a new Mutilator movie, Max is gung-ho about seeing it, but PJ would rather pass. Chiding his son for not wanting to go, Pete eggs him on, even offering to pay for them to see it. Meanwhile, Max has to convince his dad to let him see it, even though Goofy warns Max that it'll give him nightmares. Though PJ enjoys the movie while Max gets the hiccups, they both become overly jumpy and paranoid when they get home.
Story writing is good and well-paced. Its focus on Max and PJ lets us see their personalities and how they contrast with those of their parents. Max is smart, adventurous, and outgoing, while PJ is much more reserved and introverted. Goofy and Pete's personalities have been established in previous Disney fare, so their behavior isn't too far from what we'd expect based on their previous appearances.
Animation is top-notch. Disney TV's Australia department handles the animation for most of the episodes, including this one, and seems to do the best work with drawing the characters on-model without some of the quirks that other studios do. For example, Kennedy Animation tends to add plenty of bounce and stretch to their characters, and has been notorious for drawing their characters in Popeye-esque fashion, where they're speaking out of the sides of their mouths.
The biggest plus for this episode, however, is the music. Unlike the rest of the episodes in this series, Robert Irving composes the music, which gives the episode a more appropriately ominous feeling from the beginning. Unfortunately this was never carried over to the other episodes, but given the direction the show seemed to take, it may not have worked as well either.