Can someone explain this reference to me please? (Season 2, Episode 7)

http://www.imdb.com/title/tt0859555/?ref_=nm_flmg_act_6

At the end of the episode when Det. Diana Ballard lets Sam and Dean go...

Dean: Does she look familiar to you?

Sam: No...

Dean: I'm hungry. I could really go for some pea soup.

I have a feeling this was a reference to a show/movie Linda Blair did in the past and this was a breaking of the fourth wall. Can someone explain this reference please? Thanks.