Sheldon's imagination has Diedrich Bader voice Batman, and Kaley Cuoco voice the swimming pool.
Diedrich Bader and Kaley Cuoco both voice Batman and Harley Quinn, respectively, on the TV series Harley Quinn (2019).
This is only the second time we hear Sheldon's mother sing "soft kitty" to him.
Craig T. Nelson and Wallace Shawn both 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 most all of his gifts for her once he was told that was 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 called, "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.