When Chris Tarrant calls Jen on "Who Wants To Be a Millionaire" she is/isn't wearing shoes between shots.
When Roy first finds about Jen getting Daniel's question wrong, his glasses change in between exchanges. This could be deliberate, but the speed at which they exchange words makes it absurdly humorous.
When Roy and Moss are viewing the picture of Roy's date on the computer at pre-broadband speed, the girl very clearly has dark, brown hair. But when Roy meets her at Messy Joe's, she is a blonde.
When Jen receives the phone call and she becomes excited, her shoes are alternatively off and on between shots.
While Moss is explaining to Roy the previous evenings events on Who Wants to be a Millionaire, his sunglasses change during each camera cut.
On Moss's 'Lonely Faces' profile shown at the end of the episode, it states that he is 22 years old. However, earlier he tells Roy that he is 32. Although he may simply be lying on his profile to seem younger.