Continuity mistake: In the beginning when the photo of the Master is broken, the pieces of glass change position and then disappear altogether.
Continuity mistake: The bite mark on the photo of the Master changes throughout the movie. Sometimes it's in the middle, sometimes it's nearer to the corner, sometimes it's not there at all.
Continuity mistake: When the song in the warehouse is about to play, the record player has no crack on it, but when the song starts, it has a large crack near the top.
Continuity mistake: When all the appliances are leaving their house for the first time, the doorknob is on the wrong side of the door and the door opens from the wrong side as well.
Answer: A couple things I noticed, in the beginning a lot of times the cords are missing when we should see them, so perhaps Kirby is suppose to be plugged in the whole time. They made it clear he was plugged in as they were leaving, even though they also made it clear Toaster didn't need to be plugged in. But also, it could be the same as lacking a lunch. They could move around without being plugged in, but would still need power at some point the same way people would need to eat. Or because Kirby is doing the heavy work. In the book they made it clear the vacuum needed to be plugged in and was using extension cords at first as they rolled around outside, but they didn't make any indications the other appliances were still plugged in, but the other appliances couldn't move like the vacuum, and certainly not as freely as in the film.