Parshas Chayei Sarah: Gittin-related Halachos

First, From Haftorah:
אמר להו קראו לי לבת שבע וכתיב (מלכים א א) ותבא בת שבע אל המלך החדרה אמר רב יהודה אמר רב באותה שעה קינחה בת שבע בשלש עשרה מפות
(Sanhedrin 22)
Rashi says we know Bas Sheva wiped herself 13 times because there are 13 words in the Pasuk:
טו וַתָּבֹא בַת-שֶׁבַע אֶל-הַמֶּלֶךְ הַחַדְרָה וְהַמֶּלֶךְ זָקֵן מְאֹד וַאֲבִישַׁג הַשּׁוּנַמִּית מְשָׁרַת אֶת-הַמֶּלֶךְ
So, the Gra said we see from this that the name Bas Sheva is one word - if it is 2 words, then this Pasuk has 14 words - so in a Get it is written as one word.
--Kol Eliyahu, Sanhedrin 22

Second,

In a Get, we write the city and the water sources of the city - river, ocean, sea, wellsprings, wells, etc. (see here for an example). See Shulacha Aruch E"H 158. Haghos Ashri (Gittin 4:7) says we write the river just as a siman (perhaps if there are multiple cities with the same name. For example, in The Aryeh Kaplan Reader, there is an article about how to spell Monsey in Hebrew in a Get. He mentions that there are 3 cities in the US with that name, (one is spelled Muncie in English). The significance of that is in the determination of the proper pronunciation of Monsey (e.g., not Moonsey). Then they (meaning Rav Moshe Feinstein) had to determine if Lake Suzanne was a nahar or not. [I think Lake Suzanne has since dried up, but that's a different issue.] So we would know that a Get from "Monsey on Nahar Lake Suzanne" was not the Muncie in Indiana.)

Meshech Chochma proves from our Parsha that Maayan and Be'er are used interchangeably in the Torah and Gemara. Because one Pasuk says Rivka came to the Maayan and in another Pasuk it says she ran back to the be'er.

--Meshech Chochma, Breishis 24:16