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)
John Winchester, is pretty much like Dumbledore in this fandom. His curse was that he understood too much. he was too wise, too broken and too strong.
Everyone keep saying that John was a bad father because he introduced his sons into this life. but guess what?! he didn't! he didn't introduced them to this life, they were already a part of this life. They were meant to be.
As that Cupid said, It was a big deal getting Mary and John to fall in l’amour so that Sam and Dean are born to be Lucifer and Micheal's vessels to fulfill destiny of this world, the apocalypse, God's plan.