In this episode, Max told his dad that cats are colour-blind, but in actuality, cats are partially colour-blind, meaning that they can only see certain colours.
In this episode, Pistol stated her age at 6 years old, while she was 4 1/2 in most others, especially in Hot Air.
Technical Error: When the doctor showed Goofy the X-ray sheet, the scene where places the sheet on a lighted glass wall and the next scene which is 180 degrees from the other scene showed that the X-ray sheet had Pete's skeleton and the gopher's reversed.
Technical Error: When the audience were angry the first time (after Goofy told them a bad joke), PJ was seen in the crowd, when he was stuck in the trunk.
The dummy Goofy uses looks like Goofy from the old Goofy shorts of the 30s and 40s, but with different clothes colours (red hat, red shirt and yellow sleeveless outer shirt).
Max and PJs band is called The Goof Troop.
Technical Error: When Sir Goofy Knobknees rubbed horsehair against the metal bar and caused a screech, Fester's beard returned to normal at one point, when it was already plucked too much.
Running Gag: During the tournament, the trumpets were played near Prince Freddy's ears, causing him to shudder.
This is the first time Goofy uses the family photo album.
Running Gag: PJ couldn't pull out a weed, but when Pete pulled PJ, the weed was also pulled out to its root.
Technical Error: After Max grabbed Pistol's shoe when he and his dad were chasing Pistol on balloons, Pistol's shoe was still on her foot at all other times.
In this episode we learn that Pistol loves to fly.
In this episode we learn that Pistol is 4 1/2 years old. Despite this, she said that she's 6 years old in "Fool's Gold".
Donald Duck made a cameo appearance in this episode, on one of the artist teacher's flash cards which he showed Goofy to act out what he showed as a mime. Goofy ducked.
Goofy mentioned Elvis' name in this episode. He mentioned about how he felt when he was buried with people who tried to capture him, because Goofy thought he was too famous to be alive.
Technical Error: After Pete stopped his bulldozer, the moat wasn't made in a full circle. From the next time the moat was seen, the moat was a full circle.
Technical Error: Even though Max and PJ referred to themselves as Tinfoilians, other people refer to them as Martians. Moreover, in the beginning, they referred to themselves as Tinfoilians, but they referred themselves as Martians.
Technical Error: In the beginning of the episode, the ball that fell out of the model solar system was a red ping pong ball (representing Mars), but when PJ went to retrieve the ball, the ball was white. It could either be a different ball or a technical error.
Running Gag: Max was often cited to look like his father, even mistaking him as his father when he was disguised.
After Max and PJ crash into the ramp, and Max has admitted that it was him, and not Goofy who did the stunt, PJ comes up, and he's wearing his usual blue jacket. When they were riding the skateboard he wasn't wearing it. Did he run back home and get it and put it on in about 1 minute?