# If one only has one whole loaf of bread and a broken piece one should use the whole one for Seuda Shelishit instead of saving it for Melava Malka. <ref> Biur Halacha 291 D"H VeLePachot </ref>
# One doesn't need to cover the loaves of bread before making HaMotzei, however, it's preferable to cover them. <ref> Yalkut Yosef (Kitzur S"A 291:9) </ref>
#One should try to have fish even for seuda shlishit, except if one doesn't like fish he should not force himself. <ref> Yalkut Yosef Shabbat volume 1 page 408. Mishna Brurah 242:2 says this enhances kavod shabbat.
# The earliest time to fulfill Seudat Shelishit is from 6 and a 1/2 hours (Shaot Zmaniot) into the day. <ref>S"A 291:2
. Yalkut Yosef shabbat volume 1 page 402. The Behag quoted by the Ran [[Shabbat]] 43b "tanu rabanan" says that it could be eaten at any time of the day, but Tosfot [[Shabbat]] 118a "bimincha" and Rosh [[Shabbat]] 16:5 say that it is specifically at the start of mincha gedola. Shulchan Aruch rules like Tosfot and the Rosh. Aruch Hashulchan 291:3 says that you don't fulfill your obligation if you eat earlier than that. </ref> If one began before the time and continued and ate at least a kezayit after the time he does fulfill his obligation for seuda shlishit. <ref> Yalkut Yosef shabbat volume 1 page 402. Aruch Hashulchan 291:6 says also that if one began before mid-day and had in mind to continue until after mid-day and fulfill his obligation then he does fulfill it. </ref>
# The Minhag is to eat Seudat Shelishit between Mincha and Maariv/Arvit. <ref> Rama 291:2. Yalkut Yosef shabbat volume 1 page 402-403 Rabbeinu Tam quoted by the Tosfot Pesachim 105a "vihani milei", as well as the Rosh [[Shabbat]] 10:13 say that one should eat before saying mincha because it is forbidden to drink water between mincha and arvit on shabbat because drinking between mincha and arvit could cause harm to the souls that leave after shabbat. Rambam Hilchot [[Shabbat]] 30:10 writes that it is best to eat it after saying mincha and the hagahot maimoniot hilchot shabbat 30:20 agrees and quotes a different version of rabbeinu tam. The Rama quotes both opinions and says that the minhag is to do like the Rambam. The Magen Avraham 291:5 says this is because of the prohibition to eat before davening mincha. Aruch Hashulchan 291:4 also says the minhag is that way also. </ref> If one is unable to have it after mincha one should have it before mincha. <ref> Aruch HaShulchan 291:4. Mishna Berura 291:11 says to make sure to eat before the time of mincha ketana arrives. Yalkut Yosef Shabbat volume 1 page 402 says also that you fulfill your obligation but should try to get somebody to remind you to say mincha if you are going to eat before saying it. </ref>
#Although it is forbidden to begin eating after sunset until one says havdala, <ref> Shulchan Aruch 291:1 </ref> and it is definitely preferable to eat before sunset, some poskim give extra time to begin the meal if one hasn't yet eaten seuda shlishit.