Invasion

Russell says "Maybe they thought I was a fireman." Eddie Cibrian played an FDNY firefighter on Third Watch named Jimmy Doherty.

We learn in this episode that whoever (or whatever) is reproducing people cannot reproduce the scars that indicate a woman has experienced childbirth. But this opens up other questions: what about circumcision (in males)? or navels? or tanning marks? There are a number of other incidental scars and imperfections that would be difficult if not impossible to recreate in a clone. And wouldn't Mariel, a doctor, think to have herself checked for stretchmarks and/or C-section scars?