Hole in One - S4-E3
Revealing mistake: When the post is being posted through the door, you can see the letters appear in the letterbox and then wait a few seconds for Albert to hang his coat up before being pushed through. (00:01:00)
Hole in One - S4-E3
Continuity mistake: At the begining of the episode, there is a box that is by the table Rodney is sitting on. A little later, Albert and Del come and open that box. The box disappears and then reappears between shots. (00:02:05)
Hole in One - S4-E3
Continuity mistake: When Rodney says "yeah he did. The landlord.", in reply to Solly, he has a glass up to his mouth. In the next shot, he has obviously just swallowed what was in there, the glass is back on the table and you can see his cheekbones moving.
Hole in One - S4-E3
Revealing mistake: Uncle Albert is seen putting the post back through the letter box. If you watch the scene carefully, the letters appear to pull themselves through, no doubt with a helping hand from the crew.
Chosen answer: An apparent long string of illnesses.