Although Iris West (Paula Marshall) was intended to be a regular character on the series, she was written out after the pilot.
Barry Allen's older brother's name is Jay. Jay Garrick was the original Flash in the comic books.
S.T.A.R. Labs is located at 50 Garrick Avenue. This is a reference to the Golden Age Flash Jay Garrick.
M. Emmet Walsh plays the father of Tim Thomerson. In real life, Walsh is only 11 years older than Thomerson. Walsh also plays the husband of Priscilla Pointer and their characters are supposed to be close in age. In real life, Pointer is 11 years older than Walsh.
Jay Allen was born in 1948.