"Moon cheese shares soar." is written on the newspaper that Gromit is reading at the beginning of the episode, a reference to "Wallace and Gromit: A Grand Day Out" (1989). See more...
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Continuity: In the beginning Gromit is pouring tea and there is a teacup and toaster near the pot. Gromit sets it down, gets the mail, and then comes back. When he comes back, the cup is much further away from the teapot and the toaster is on the other side of the table. No one has been in the room since Gromit left.