I assume you're supposed to wait until shabbat is fully out to start the seder? We didn't bother, because it would have been ludicrously late at this time of year, but in theory, you're supposed to, right? Then what? How do you light the festival candles if it's already been chag for an hour? Are you supposed to mess around with tapers and a long-burning candle?
Obviously you do havdalah before starting the festival stuff, that's normal, but how exactly does it work? The best instructions we could find implied that you were supposed to do "between holy and holy" with only the candle, leaving out the wine and spices. I don't quite get that either; I assume you don't do the wine because you're about to make kiddush anyway, and you don't want to bless the same wine twice. But why leave out the spices? And with the fire, Screwy thought that you say "the lights of the fire" over the festival candles themselves, rather than lighting a havdalah candle. Dad thought you should light the havdalah candle and then not extinguish it, because as soon as you lit it it would be chag, but I'm not sure that's right, I have it in my head that you can extinguish on chag even if you can't light.
In terms of food, it makes sense that you're supposed to clear out the chametz by lunch time (or halachic midday, or something) on Friday, and then not eat any chametz over Shabbat. Fine. But does that mean you eat breadless meals with no motzi, even on Shabbat itself? Or is there some workround I haven't thought of?