There seems to be some sort of bug with the clock in your house. I had a wall clock for a while, and now I'm looking at it and I have the first clock again. Mousing over it says:
Total Playtime: 0-1158:0-58:0-6
And it's counting down in some fashion. I'm not sure what it means, but I'm pretty sure it's a bug.
Gold is possible on every level. It often requires hitting the ref, which gives you another 5 seconds. I've got all golds, and the whistle on every level except 15, where there doesn't appear to be a ref.
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