The Unlucky Winner Is... - S6-E4
Continuity mistake: The amount of wine in the bottle at the start changes from when Uncle Albert comes into the room to when he takes it back to the kitchen. (00:06:25)
The Unlucky Winner Is... - S6-E4
Revealing mistake: When Rodney and Del are sitting on the balcony and Cassandra has gone to get Rodney a drink, if you look in the glass door, you can see Cassandra's reflection with the drink waiting for her cue to come in.
The Unlucky Winner Is... - S6-E4
Revealing mistake: In the airport scene, the same extra walks past 3 times wearing different clothes.
The Unlucky Winner Is... - S6-E4
Visible crew/equipment: When Rodney is talking to Cassandra in the pub, the shadow of a crewmember/camera is visible on numerous occasions behind Rodney.
The Unlucky Winner Is... - S6-E4
Revealing mistake: After Rodney berates Del whilst he's in the bathroom of the hotel room he and Cassandra go out to the balcony and Cassandra goes to get him a drink, Del then goes out to join him. Whilst they're talking you can see Cassandra in the reflection of the balcony door waiting for her cue to come in to give Rodney his drink.
Chosen answer: An apparent long string of illnesses.