Explanation #1: "That have a Beis Dirah (place to dwell)" does not apply to Nefashos, like is proven in the Beraisa, for Stam, Nefashos themselves are for residence of the one who guards the grave;

Therefore, even though he does not live in it, it is a residence. Nefesh is a building on a grave, like Rashi explained in the Gemara.

Rather, ["that they have a Dirah"] refers to bridges.

A bridge, grave, Beis ha'Keneses, and all those taught in the Gemara in the Beraisa that have a Beis Dirah, it is not made for residence. If it does not have a Beis Dirah, it is not a residence.

Explanation #2 (Aruch): Nefesh is a monument over a grave, like we say in the Yerushalmi "R. Shimon ben Gamliel said, we do not make Nefashos for Tzadikim. Their words are their commemoration", and so [the Aruch] brought from [the Yerushalmi in] Shekalim. (Be'er Moshe - if so, "that have a Beis Dirah" applies also to Nefashos. Also R. E. M. Horowitz connotes like this.)

Implied question: It says in Yevamos (57a) that R. Yochanan asked from R. Oshaya about a Patzu'a Daka Kohen...!

Answer: That was not during the 18 days [that he grew up there].

Alternative text: R. Chananel's text says "b'Bizri", i.e. when one sinks his finger into [a pile of] seeds, e.g. mustard, it looks like a crater, and when he removes his finger, [the seeds] return and fill the crater immediately;

So we, when we finish a tractate and begin another one, immediately we forget the first.

Explanation: For the text [of Mishnayos, Beraisos and teachings], one Rebbi is preferable, lest he confuse their text (if he hears different versions from different Rebbeyim);

However, for reasoning, we say in Avodah Zarah (19a) that anyone who learns from only one Rebbi will never see a Siman of Brachah.

Explanation: This is the Kli with which they draw wine from the barrel.

Support: It says in Shabbos (119a) regarding R. Yosef who used honored Shabbos, and [a different episode] in Bava Basra (133b) with Yosef ben Yo'ezer, that [a gem] was sold for 13 Ilisa of Dinarim (coins). R. Tam explains that Ilisa is a Kli, like Alas here;

This is unlike Rashi explained there, that it means [13] attics, and it is an exaggeration.

Explanation (R. Chananel): This refers to Ushpizkana (innkeeper). The Targum of Ish is Gever; [the Targum of] Pi is Fum, of Zeh is Dein, of Na is Chai. The Targum of "Al Tochlu Mimenu Na" is "Kad Chai."

Citation (Maseches Derech Eretz 4:3): We leave [food in] a corner of things cooked in a pan, but and we do not leave a corner in things cooked in a pot.

Explanation: What is made in a pan, he appears gluttonous if he does not leave over. However, what is cooked in a pot, he does not appear gluttonous if he does not leave over. (Zichron Menachem - such food is for satiation. Presumably, he received enough. Also the host cooks extra for his family. These do not apply to what is made in a pan. Perhaps this is also the Maharhal's intent.)