Plot hole: Live 50th anniversary episode, aired December 9th 2010 - When Sally is allowed into the rubble to comfort Molly as the firemen attempt to free her, one of them says they'll get Sally a hard hat. When we see her talking to Molly in the rubble, she has no hard hat on and instead one of the firemen is hilariously holding his hand above her head.
Plot hole: Given that Ken and Dierdre had to re-mortgage the house in order to pay for Tracey's legal fees, and their joint income isn't exactly huge, how are they not out on the street by now?
