During Sheldon's imagination scene, Diedrich Bader voices Batman and Kaley Cuoco voices the swimming pool. Diedrich Bader and Kaley Cuoco voice Batman and Harley Quinn, respectively, on the TV series Harley Quinn (2019).
This is only the second time Sheldon's mother is seen singing "Soft Kitty" to him.
Craig T. Nelson and Wallace Shawn previously provided voices in The Incredibles (2004) as Bob Parr/Mr. Incredible and Mr. Huph, respectively.
The bow on the giant cookie box that Dr. Sturgis sends Connie is purple. This is in line with almost all of his gifts for her, after he was told that purple is her favorite color in his first appearance.
Sheldon's English teacher, Ms MacElroy (Valerie Maheffey) is reading a romance novel in the teacher's lounge titled, "Captive Splendors", by Fern Michaels. The book's description reads: "They struggled to deny their forbidden love, their splendid passions imprisoned by unspoken desire. A sizzling story of love and desire swept away upon the sea".