Corrected entry: When Wallace falls through the trap door to the breakfast table, the automatic dressing machine puts his right sleeve on first, then the left. When Gromit later accidentally falls through, it puts the left sleeve on him first. Even though Gromit is backwards in the chair, the machine obviously doesn't know this, because it puts the shirt and vest on facing forward.
Corrected entry: When Gromit spies on the penguin under the box, the penguin suddenly stares in his direction. Gromit blinks. But then the penguin walks away without doing anything. Why wasn't Gromit revealed when he blinked? The penguin was staring right in his direction.
Correction: Penguins have very poor eyesight - especially plasticene ones who appear in light-hearted comedy films.
Corrected entry: When Wallace drops out of bed, into the kitchen and has jam splat on his face, the jam is 'fired' automatically. But earlier when we saw the same thing happen, Gromit needed to press a button to 'fire' the jam, so it would land on the toast.
Corrected entry: While Gromit is waiting outside the bathroom on the morning following his bad night in the doghouse, Wallace passes him on the way downstairs. He's fully dressed. In the very next scene, Wallace has somehow gotten back into his dressing gown. (00:09:04)
Correction: Wallace probably got dressed to go out and run an errand then came back to shower and everything after Gromit and the penguin were finished in the bathroom.
Correction: Yes, and the jam flinging machine later shoots a load right in Gromit's face. Wallace is an inventor in the Heath Robinson mold, and when his inventions do work, they don't always work properly. Sometimes it's the left sleeve, sometimes the right, sometimes both or neither.