Im sorry I can't add pictures because I'm typing this from my iPod but I'll add the lookalikes names and toi can look them up :)

* means that they look nearly EXACTLY like their lookalikes

Javier Bardem looks EXACTLY like Jeffrey Dean morgan (John Winchester)* Also Robert Downey Jn.

Jared Padalecki(Sam Winchester) apparently looks like Nick Wechsler (im sorry ealier on I wrote he looked like Neil Wechsler par accident lol, if u want to end up in hysterics chercher neil wechsler up lol)

Jensen Ackles (Dean Winchester)-link and Emilio Eztevez (only a teeny bit though)

Samantha Ferris (Ellen Harvelle)- Paget Brewstar

Alona Tal (Jo Harvelle) - Bridgit Mendler*

Chad Lindberg (Ash) - Giovanni Ribsi

Samantha Smith (Mary Winchester) - Robin Wright*

Misha Collins (Castiel) - I've always thought he looks like Bruno Mars.

Lauren Cohan (Bela) - Rachel Blakely (thank toi shomill :))

When I find plus look alikes I will add plus :)