Two Plumbers and a Baby - S1-E17
Continuity mistake: In one scene, Luigi is wearing the same color hat as Mario and when Luigi opens his mouth to talk, it's Mario's voice we hear.
Two Plumbers and a Baby - S1-E17
Revealing mistake: When Mario and Luigi look at what King Koopa is doing with the infants in the castle, one of the infants is laid out of the castle instead of inside it, and shortly after, a tricycle is laid over another tricycle. (00:06:31)
Two Plumbers and a Baby - S1-E17
Continuity mistake: When Mario says that they have to free the children, his black sideburns turn red, like his cap. (00:06:43)
Two Plumbers and a Baby - S1-E17
Continuity mistake: Normally, the castle has a door, but when King Koopa says that the infants will have to do all of his chores, the door disappears. This also happens when Luigi is trying to listen in on what is happening inside the castle. (00:06:05 - 00:06:27)
Two Plumbers and a Baby - S1-E17
Audio problem: When Luigi says that the Princess is gone, he speaks through Toad's mouth, and shortly afterward, the fireflies freeze for a few seconds as the camera pans. (00:14:13)
