When Rodney is sitting on the chair and starts eating crisps, you can see that he is sitting on a cushion. It is gone by the time he gets up.
When Uncle Albert gets up off the couch the home solarium is on, in the next shot it is off. Also the knob is pointing in a different position.
Del claims to have been a "Paratrooper". When he is about to take off with the hand glider Rodney refers to him being a "Green Beret". Factual error, Paratroopers have "Red Beret's.
Rodney says he used to play with Lisa when they were children, but in "Big Brother (1981)", Rodney had to be introduced to Lisa's uncle Trigger as if they had never met before.