Don't worry about cals yet, after about 2 weeks it might be worth looking at them - I eat anywhere between 1200-1800 per day with occasionally a day higher or lower.
I also often have a bit more than the recommended amount of cream - it's unlikely to do you any harm this early on but try to keep it to roughly 2tbsp per day. You definitely haven't ruined your day, it's only limited because of the very high cals and because occasionally people find cream stalls them
Jelly is very unlikely to kick you out of ketosis although some people can be very sensitive to it. Again, for most people having it now and then won't hurt at all. If you find you stop losing after a few weeks (second and third week don't count as loss often naturally stalls in one of those weeks while your body adjusts) then try cutting it out - though if you can get by happily without it cutting it now obviously won't hurt either - as long as it doesn't send you hunting other sweet things.
My mouth doesn't taste funny after the 2nd or 3rd day of ketosis. Idk if that just means I get used to it or if it's because I drink enough to dilute it but it doesn't indicate a problem to me.
Aim for around 20g carbs per day mostly from vegetables - try spinach, cauliflower, courgette, asparagus, rhubarb (yes it's a vegetable) and salad leaves.
MFP said f I wanted to loose 1 lb a week I have to eat 1270 kals - think yesterday I had about 1600 so not too bad really 
