In the first series, the "Girl's Pub" is the Mayhew, while the "Boy's Pub" is the Archer (in subsequent series only the Archer is used), a reference to script editor Paul Mayhew-Archer.
Gaz: [the song Gaz sings every night before he sleeps so not to dream about sheep]
Bringing in the sheep, bringing in the sheep. What do we do before we sleep? We bring in all the sheep.