Writer/translator Leslie Swan, who worked on the Super Mario Adventures comic, has voiced two female characters in the Mario series: Princess Peach in International versions of Super Mario 64 and Mario Kart 64, and Mona from the WarioWare series. Now note the sequence where the Princess shows up as part of a pizza delivery, matching Mona's employment in Twisted. Better yet, the delivery was made by Yoshi, making him a Pizza Dinosaur.
Not only that, but if one looks closely, she can be seen holding a bouquet of piranha plants in one panel.
Inferred Holocaust: Toad is never seen after the eighth episode. Then we remember that Bowser threatened to turn the Princess' people into stone if she said no to his marriage request. Though as long as there are people like the Minister of Massage around, maybe not.
In the first Mario vs. Wario comic, Mario is revealed to be only 20-something years old (it's been 20 years since he saw Wario, last time he did they were small children), long before Super Smash Bros. Melee confirmed his age at ~26.
Bowser has a Magikoopa acting as an advisor, four years before "Kamek" was introducednote Kamek is the name used for all Magikoopas in Japan, but one has a notable role in Yoshi's Island.
This comic was also the origin of "Weege(e)" (used here as Mario's affectionate nickname for Luigi), long before the Mario Is Missing! memenote Or the Mario & Luigi RPGs, for that matter. In the second game, if Baby Luigi is knocked out, Baby Mario will cry out "Weegee!!"..
Wario's introduction to Mario towards the end of Mario vs. Wario: "It's me, Wario!" Jump forward three years and Mario would introduce himself in a similar way. And then another eleven years in Wario Ware Smooth Moves with another twist to it as "It's-a Wii! Wario!"
Spoiled by the Format: The trade's table of contents reveals in advance that chapter eight has more than two pages, making its premature The End card less convincing.