Guttural R
Many Jewish immigrants to Israel spoke a variety of Arabic in their countries of origin and pronounced the Hebrew rhotic as an alveolar tap , similar to Arabic '. Gradually, many of them began pronouncing their Hebrew rhotic as a voiced uvular fricative , a sound similar or (depending on the Arabic dialect) identical to Arabic '. However, in modern Sephardic and Mizrahi poetry and folk music an alveolar rhotic continues to be used.
Yemenite Hebrew
Rabbi Abraham Isaac Kook and Rabbi Jacob Saphir have praised the Yemenites in their correct pronunciation of Hebrew. They still read the biblical lections and liturgies according to what is prescribed for Hebrew grammar and are meticulous to pronounce the mobile "šĕwā" in each of its changing forms. While most other communities also adhere to the rule of mobile "šĕwā" whenever two "šĕwā"s are written one after the other, as in , most have forgotten its other usages.
Aharon Ben-Asher, in his treatise on the proper usage of Hebrew vowels and trope symbols, writes on the "šĕwā": "[It is] the servant of all the letters in the entire Scriptures, whether at the beginning of the word, or in the middle of the word, or at the end of the word; whether what is pronounced by the tongue or not pronounced, for it has many ways… However, if it is joined with one of four [guttural] letters, א ח ה ע, its manner [of pronunciation] will be like the manner of the vowel of the second letter in that word, such as: בְּֽהֹנוֹת ידיהם ורגליהם = "bhonoth"; מתי פתים תְּֽאֵהֲבוּ פתי = "t’ehavu"; עיניו לְֽחֵלְכָה יצפנו = "lḥeləkhah"; שריה רְֽעֵלָיָה מרדכי = "rʻeloyoh"." 
On the mobile "šĕwā" and its usage amongst Yemenite Jews, Israeli grammarian Shelomo Morag wrote: "The pronunciation of the "šĕwā" mobile preceding א, ה, ח, ע, or ר in the Yemenite tradition is realized in accordance with the vowel following the guttural; quantitatively, however, this is an ultra-short vowel. For example, a word such as is pronounced "wḥuṭ". A "šĕwā" preceding a "yōḏ" is pronounced as an ultra-short "ḥīreq": the word is pronounced "byōm". This is the way the "šĕwā" is known to have been pronounced in the Tiberian tradition."