When in Luigis Mansion He encounters Toad obsessing over having dropped something in the toilet and then talking about flushing it in graphic detail, he comments that Toad sounds like NintendoCapriSun.
In episode 3, when he finally finds a Slakoth after looking for over half an hour, he shouts, "FOR THE LOVE OF PRINCESS ELISE'S NONEXISTENT PANTYHOSE!"
When confronted with an enemy called Marc, he says "Oh hai Mark!"
After defeating Victor of the Winstrate family, he tries mimicking Uncle's "AIYA!" and outright mentions the show's title. The show gets another reference when he's playing Mario Party 3 with Jon and Tim in Creepy Cavern.
In episode 11, when showing where he can and cannot go in Pyrite Cave, he says "We try to go to the left, and there's some real cool boxes that I'd like to break and take the goodies inside, but unfortunately, I'm not Gordan Freeman."