Hidden Details: Unexpected Wassistance

Welcome to the ninety-first episode of the Hidden Details blog!

Have you found some obscure reference or detail in this comic? A JoJo reference? A sneaky little Loss? A callback to a previous comic? Let us know what you've found in the comments! Every detail that has been found will be added to the list below. Once everything has been found, this comic will officially be marked with "all details found".

Please only comment with ONE hidden detail or reference!

There ONE Loss, ONE Balthazar, and NO JoJo reference. Bonus panels don't count.

1: Kazuya's kart is breaking under the weight of all the Mushroom Kingdom characters in the first panel (but mostly Bowser). Carrick RaccoonBro Inabnett noticed it first!
2: Outside of Waluigi's windows, one can clearly see the Mushroom Kingdom. I had to make sure that was noticeable because I drew the exterior of his house in that Sephibutt comic. Good catch, Gavin Walker.
3: Waluigi has some roses in his office, which indeed seem to be a theme with him, Put 9-Volt In Smash Bros Please. I'll admit it's what inspired me to put lover in his title, hahaha.
4: Next to that, his tennis racket is also proudly showcased. Erin noticed it first. I put the racket in there because he debuted in Mario Tennis and every time I see fan-made movesets for Waluigi the tennis racket is always included.
5: Waluigi has a little name plate on his desk that reads "Waluigi - Pro tennis player, kart racer, lover". Obviously referencing his appearances in Mario Tennis, Kart and his sensuality. Found by Magnus first.
6: Finally, the last prop behind Waluigi is a drawing of the kanji 悪 (waru), which means bad or evil. Apparently Wario's name is based on this kanji, so I assumed Waluigi's name is, too. Good catch, Werwally.
7: Correct Dirtydan8991! Waluigi is indeed talking about Drifloon while discussing how messed up their universes are. There were a few other Pokémon I could choose from but Drifloon whisking kids away to the afterlife is pretty much the darkest I could remember.
8: You're right Daniel Myhre, they just threw the old Yoshi in the trash can. Poor guy.
9: Lakitu makes yet another appearance, once again as a camera man/photographer. This is indeed referencing him being the camera in Super Mario 64 but also his previous appearance in the comic from one week earlier, Tejayes.
10: A LOT of people mentioned this one, but Luke was first: one of the floating islands in the the background of the sixth panel is sus.
11: This week's loss was indeed on Kazuya's glove in the first panel: the little round bead things form a loss. Glad you found it again, Trigger.
12: Balthazar made a subtle appearance as a little silhouette in the fourth panel, as found by Cameron Devera!

Finally, two errors:

13: One found by John Hattan: I messed up Mario's colours and inverted them. Also, he should have been wearing his psychologist outfit. I think I might retcon this soon but for now, enjoy the mistake.
14: I accidentally flipped the L on Waluigi's gloves. Hawk-eyed Zora Marslink noticed it.

After one week, I'll reveal all the details that haven't been found. These ones are written in italic.