Other mistake: At the start of the episode we're shown a preview of the episode's plot: while Fred stretches his leg on the ballet bar his leg gets stuck and when the ballet teacher pushes his leg down, the part of the ballet bar which Fred is leaning on is gone. What's odd is that during this scene within the episode the ballet bar is perfectly intact. (00:00:25 - 00:14:40)Super Grover
Continuity mistake: After Fred and Barney leave for the hospital without Wilma they realise the mistake and head back to the house, and when it cuts to Wilma in the bedroom Dino jumps atop the blue blanket on the bed, but in the next shot the blue blanket is gone, and then it reappears for Dino to hide under. (00:16:35)Super Grover
Continuity mistake: When Fred is reading his letter about his position being accepted at the Stone Valley Inn, you can see Wilma is sitting in the chair next to him, but in the next shot the chair is empty and Wilma is nowhere to be seen, then she reappears in the chair.