In Punch-Out Wii, Von Kaiser is one big German engineering joke. He might even be some kind of cyborg or android. Reasoning:
When knocked down, there's a loud "sproing", like a coil getting knocked loose inside him.
Before falling, he always goes stock still, like a wind up soldier that's out of juice.
When he pulls a punch, there's a loud clicking or winding sound, and some of them even make a shotgun blast when they connect!
He even goes so far as to call himself a Kampfsmaschine (a fighting machine).
When I heard about the supposed Downer Ending in Punch-Out!! Wii's "Mac's Last Stand", I didn't quite get it at first. Three defeats, and Mac simply retires. Then I saw the cutscene leading up to it, and then the ending scene. Then it clicked into my head. It was Mac's conscious decision. He's already become the world champion, and defended his title. He's already made his dream a reality. But he can't hold on to that title forever. Further along the line, there may be scandals, and perhaps a losing streak that will force him to retire anyway, going out with a whimper. So, he takes a third option - go out with a bang. And he makes his decision damn clear to Doc, who reluctantly goes along with it.
Doc Louis:Alright, kid. Let's go out on top. It's time to take your place in history.
It's also a Homage to Little Mac's inspiration, the titular character of Ashita no Joe, who goes out in a similar way.
Not a personal example, but many people seem to think that Little Mac is kind of a jerk for punching Piston Hondo in the face whenever he bows. A little research will tell you that looking at someone while bowing is a sign of disrespect. And Hondo does indeed give Mac a nasty eye while bowing. So Hondo's still the jerk here.
The Wii version's Aran Ryan is a unique opponent; hitting him immediately before he hits you stuns him instead of giving stars, and "dirty" only begins to describe his fighting style. Both of these (counter-punching and cheating opponents) happen to be cornerstones of the SNES' Super Punch-Out, from which he originated.
Mr. Dream may seem like an odd name at first, but remember how the final boss for the original Punch-Out and the Wii Punch-Out was named Mr. Sandman? What does the mythical Sandman do again?
In the Exhibition mode of Punch-Out!! Wii, there's one challenge in which you must beat Great Tiger using only right jabs. At first, it sounds like it's going to be a weird fight, but after a bit of research, presenting the left hand, friendly or otherwise, in Indian culture is offensive because the left hand is considered "unclean." Keep in mind that Great Tiger is Indian.
Why is Don Flamenco a notch above Bald Bull in the World Circuit of NES Punch-Out!! when Bald Bull was the Major Circuit champion, and Don was only #3? Did Don get his act together and apply some bullfighting techniques to his boxing repertoire?
Doc occasionally asks Mac if it's past his bedtime. This is not only a case of Anti Poopsocking but it's lampshading the fact Mac is a Kid Hero, something that people often forget.