It is revealed that Del has a wad of rolled up banknotes stashed in the receiver of his mock-vintage phone. But earlier, Del is seen talking to someone on this phone. This would be impossible if the receiver's components had been removed to hold the money.
During the final high-stakes round, Rodney is seated right next to Del and has a clear view of the hand he's holding. Yet he acts surprised when Del reveals his hand at the end.
When Grandad says " he knew Del had something up his sleeve", Del sleeves are rolled up so it would be impossible for him to have cards up his sleeve.
When Del Boy is talking to Grandad about his recent luck, he says "What are the odds in picking the only genuine weight watcher in London". But when he says it his mouth doesn't match what he's saying.
Grandad asks about Boycie as though he doesn't know him but Del has been friends with Boycie since school, (like Trigger and Denzil) and must know who he is and have met him.