Other mistake: When Danny falls overboard off the boat and into the water, you can hear the water splash, but you never see the water. Same with Joey, he dives off the boat, but you never see the water splash up. You would think you would see water splash up especially since how Joey jumped in. That would create a big splash.
Other mistake: In the opening credits when it shows their house, you can see the garage is located in the front of the house. But when the family goes down to the garage or Joey's room when it was later transformed, they used the stairs all the way in the back of the house to go down to the garage. So that would mean the garage is really big, (which it isn't when you're inside it or its not the same house).
Other mistake: At the beginning of the episode where the twins and Joey are doing handprints in plaster, Jesse walks to the kitchen to put the plasters away, comes back to the twins and only wipes one of the twins' hands. The shot changes to Joey for a short couple of seconds then back to Jesse, who is finishing wiping the same twin's hands, now saying that both boys hands are "de-icka-fied." Also, before he started wiping the one twin's hands, the kid lifted his hands up in view and they were already clean. (00:00:30)
Other mistake: When Danny enters the bathroom, there is a window in the wall next to the door with daylight coming through. Yet according to the house plan, the stairs to the attic are supposed to be located behind this wall- the door to them is even seen in the background as the pizza guy passes them in the hallway. (00:04:50)