They are normally baked on the day before Shabbat, rather than on Shabbat: Pesachim 47a
They aren't baked on Holidays, although they are for consumption: Pesachim 47a
They aren't baked on Rosh HaShanah: Pesachim 47a
They aren't baked on Yom Kippur: Pesachim 47a
They aren't made of Leaven: Pesachim 37a
Setting up the support rods below each level on the table on Shabbat: Shabbat 123b-124a
The Shewbread is One Hand-Breadth thick: Pesachim 37a
Method of switching the loaves on Shabbat: Shabbat 133b; Megillah 21a
What happens if one sets up the loaves after Shabbat, instead of on Shabbat: Menachot 49a, 50a