For the understandably confused among us, "The Song Remains the Same" is the new title for next Thursday's time travel episode that was originally called "Back to the Future II." Why the name change? Maybe the CW had a rights issue.
Now on to the spoilers! In the first sneak peek, Castiel has a rough time time travelling to 1978...
In the second clip, Sam and Dean have an awkward meeting with their parents. Sam is so touched by seeing his mom, he goes a wee bit overboard. Very sweet.