As Dot cries after being branded with a barcode, graffiti can be seen to the extreme left saying "Final shot of season one!".
The access code for Dot Matrix's pad is in ASCII - numeric representation of letters, numbers, and symbols.
The access code, when translated, spells "Guardian"
The access code, when translated, spells "Guardian"
A penguin resembling Feathers McGraw from Wallace and Gromit appears in this episode.