The Big Bang Theory: 21 Easter Eggs You Probably Missed
3. Blossom Mentioned For Physics Bowl
However, fancy dress planning wasn't the first reference to Blossom in the show, with references going back as early as the classic The Bat Jar Conjecture episode where the gang split into two separate teams for the physics bowl.
When coming up with teams Raj suggests "TV's Blossom" as she has a PHD in Neuroscience. This is a true fact, as Mayim Bialik does indeed hold a doctorate in that field, though it's unknown whether she was even being considered to be cast around the time of the earliest reference to her role.