Some spoilers for 2×13 “The Dog”…
STORY LINE
Suddenly eager to have a baby, Samantha starts out with a kind of child substitute: a dog…

[FUNERAL DIRECTOR] Male, 40s to 50s. This funeral director spies a weeping Sam, and wrongly assumes she’s grieving for the deceased, not for herself…1 line, 1 scene (4) PLEASE SUBMIT ALL ETHNICITIES

[MOTHER] Early to mid 30s. A mother with a crying baby, she leaves a funeral to try and soothe the wailing kid, and hands the child over to Samantha for a few minutes…1 speech & 1 line, 1 scene (4) PLEASE SUBMIT ALL ETHNICITIES

[INSTRUCTOR] Late 30s to 50. A flight instructor, he’s ready to give Regina her first lesson in flying a plane, and tries tactfully to get her to sign a release in case of a deadly accident…ONE-DAY GUEST STAR (15) PLEASE SUBMIT ALL ETHNICITIES

[WAITRESS] Mid 20s to early 30s. This cheerful waitress recognizes Andrea, and refuses to serve her alcohol because she’s known to be pregnant…5 lines, 1 scene (17) PLEASE SUBMIT ALL ETHNICITIES

[YOUNG BOY] 5 – 7 years old. This young boy recognizes Samantha’s dog as his missing pet, Scraps…3 lines, 1 scene (25) sptv050769 PLEASE SUBMIT ALL ETHNICITIES

[TWIN GIRL #1 & TWIN GIRL #2] 5 – 7 years old. These two adorable blonde twin girls come running when they learn that Scraps has been found…1 line each, 1 scene (25) PLEASE SUBMIT ALL ETHNICITIES

[BOY IN WHEELCHAIR] 5 – 7 years old. A boy in a wheelchair, he rolls up excitedly when he learns that the missing doggie has been found…1 line, 1 scene (25) PLEASE SUBMIT ALL ETHNICITIES. We are looking for boys who are actually in a wheelchair.

[WOMAN] A woman in a restaurant, she objects furiously when Samantha’s dog gets underfoot…1 line, 1 scene (18) MAY BE VOICE-OVER ONLY. PLEASE SUBMIT ALL ETHNICITIES

(Source)